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1)
The energies of activation for forward and reverse reactions for
A2+ B2  2AB are 180 kJ mol-1
and 200 kJ mol-1 respectively.
The presence of catalyst lowers the activation energy of both (forward
and reverse) reactions by 100 kJ mol-1. The enthalpy change of the reaction
A2+ B2 → 2AB in
the presence of catalyst will be (in kJ mol-1)
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1 )
300
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2 )
120
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3 )
280
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4 )
20
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| see the answer see the solution |
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2)
The cell, Zn | Zn2+ ( 1 M ) | Cu (E°cell = 1.10 V ) ,
was allowed to be completely discharged at 298 K . The relative concentration of
Zn to Cu2+ [ [Zn2+]/[Cu2+] ] is
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1 )
antilog (24.08)
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2 )
1037.3
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3 )
37.3
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4 )
9.65 X 104
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| see the answer see the solution |
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3)
The pKa of a weak acid (HA) is 4.5. The pOH of an aqueous buffered solution of HA in which 50% of
the acid is ionized is
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1 )
4.5
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2 )
2.5
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3 )
9.5
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4 )
7.0
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| see the answer see the solution |
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4)
Consider the reaction,
2A + B → Products
When concentration of B alone was doubled, the half-life did not change. When the concentration of A
alone was doubled, the rate increased by two times. The unit of rate constant for this reaction is
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1 )
L mol-1s-1
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2 )
no unit
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3 )
mol L-1s-1
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4 )
s-1
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| see the answer see the solution |
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5)
Identify the incorrect statement among the following
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1 )
d-Block elements show irregular and erratic chemical properties among themselves
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2 )
La and Lu have partially filled d orbitals and no other partially filled orbitals
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3 )
The chemistry of various lanthanoids is very similar
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4 )
4f is shielded more than 5f
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| see the answer see the solution |
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6)
Which one of the following has a square planar geometry?
(Atomic numbers: Co = 27, Ni = 28, Fe = 26, Pt = 78)
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1 )
[ Co Cl4 ]2-
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2 )
[ Fe Cl4 ]2-
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3 )
[ Ni Cl4 ]2-
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4 )
[ Pt Cl4 ]2-
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| see the answer see the solution |
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7)
Which of the following molecules is expected to rotate the plane of plane polarized light?
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1 )
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2 )
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3 )
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4 )
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| see the answer see the solution |
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8)
The secondary structure of a protein refers to
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1 )
α - helical backbone
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2 )
hydrophobic interactions
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3 )
sequence of α - amino acids
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4 )
fixed configuration of the polypeptide backbone
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| see the answer see the solution |
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9)
Which of the following reactions will yield 2, 2-dibromopropane ?
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1 )
CH3-C≡CH + 2HBr →
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2 )
CH3CH≡CHBr + HBr →
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3 )
CH≡CH + 2 HBr →
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4 )
CH3-CH=CH2 + HBr →
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| see the answer see the solution |
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10)
In the chemical reaction,
CH3CH2NH2-CHCl3 +3 KOH →
(A) + (B) + 3H2O, the compound (A) and (B) are respectively
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1 )
C2H5CN and 3KCl
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2 )
CH3CH2CONH2 and 3KCl
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3 )
C2H5NC and K2CO3
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4 )
C2H5NC and 3KCl
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| see the answer see the solution |
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11)
The reaction of toluene with Cl2 in presence of FeCl3 gives predominantly
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1 )
benzoyl chloride
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2 )
benzyl chloride
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3 )
o-and p-chlorotoluene
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4 )
m-chlorotoluene
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| see the answer see the solution |
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12)
Presence of a nitro group in a benzene ring
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1 )
activates the ring towards electrophilic substitution
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2 )
renders the ring basic
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3 )
deactivates the ring towards nucleophilic substitution
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4 )
deactivates the ring towards electrophilic substitution
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| see the answer see the solution |
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13)
In which of the following ionization processes, the bond order has increased and the magnetic
behaviour has changed?
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1 )
C2 → C2+
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2 )
NO → NO+
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3 )
O2 → O2+
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4 )
N2 → N2+
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| see the answer see the solution |
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14)
The actinoids exhibits more number of oxidation states in general than the lanthanoids. This is
because
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1 )
the 5f orbitals are more buried than the 4f orbitals
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2 )
there is a similarity between 4f and 5f orbitals in their angular part of the wave function
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3 )
the actinoids are more reactive than the lanthanoids
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4 )
the 5f orbitals extend further from the nucleus than the 4f orbitals
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| see the answer see the solution |
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15)
Equal masses of methane and oxygen are mixed in an empty container at 25°C. The fraction of the
total pressure exerted by oxygen is
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1 )
2/3
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2 )
(1/3)(273/298)
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3 )
1/3
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4 )
1/2
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| see the answer see the solution |
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16)
A 5.25 % solution of a substance is isotonic with a 1.5% solution of urea (molar mass = 60 g mol-1) in
the same solvent. If the densities of both the solutions are assumed to be equal to 1.0 g cm-3, molar
mass of the substance will be
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1 )
90.0 g mol-1
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2 )
115.0 g mol-1
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3 )
105.0 g mol-1
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4 )
210.0 g mol-1
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| see the answer see the solution |
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17)
Assuming that water vapour is an ideal gas, the internal energy (ΔU)
when 1 mol of water is
vapourised at 1 bar pressure and 100°C,
(Given: Molar enthalpy of vapourization of water at 1 bar
and 373 K = 41 kJ mol-1 and R = 8.3 J mol-1K-1) will be
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1 )
4.100 kJ mol-1
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2 )
3.7904 kJ mol-1
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3 )
37.904 kJ mol-1
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4 )
41.00 kJ mol-1
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| see the answer see the solution |
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18)
In a sautrated solution of the sparingly soluble strong electrolyte AgIO3 (Molecular mass = 283) the
equilibrium which sets in is
AgIO3(s) Ag+(aq) + IO-3(aq)
If the solubility product constant Ksp of AgIO3 at a given temperature is
1.0 x 10-8, what is the mass of
AgIO3 contained in 100 ml of its saturated solution?
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1 )
28.3 x 10-2 g
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2 )
2.83 x 10-3 g
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3 )
1.0 x 10-7 g
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4 )
1.0 x 10-4 g
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| see the answer see the solution |
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19)
A radioactive element gets spilled over the floor of a room. Its half-life period is 30 days. If the initial
activity is ten times the permissible value, after how many days will it be safe to enter the room?
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1 )
1000 days
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2 )
300 days
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3 )
10 days
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4 )
100 days
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| see the answer see the solution |
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20)
Which one of the following conformation of cyclohexane is chiral ?
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1 )
Twist boat
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2 )
Rigid
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3 )
Chair
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4 )
Boat
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| see the answer see the solution |
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21)
Which of the following is the correct order of decreasing SN2 reactivity ?
(X = a halogen)
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1 )
RCH2X > R3CX > R2CHX
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2 )
RCH2X > R2CHX > R3CX
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3 )
R3CX > R2CHX > RCH2X
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4 )
R2CHX > R3CX > RCH2X
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| see the answer see the solution |
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22)
In the following sequence of reactions,
the compound 'D' is
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1 )
butanal
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2 )
n-butyl alcohol
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3 )
n-propyl alcohol
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4 )
propanal
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| see the answer see the solution |
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23)
Which of the following sets of quantum numbers represents the highest energy of an atom ?
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1 )
n = 3,l = 2 , m = 1 , s = + 1/2
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2 )
n = 3 , l = 2 , m = 1 , s = + 1/2
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3 )
n = 4 , l = 0 , m = 0 , s = + 1/2
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4 )
n = 3 , l = 0 , m = 0 , s = + 1/2
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| see the answer see the solution |
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24)
Which of the following hydrogen bonds is the strongest ?
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1 )
O-H..........N
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2 )
F-H..........F
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3 )
O-H..........O
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4 )
O-H..........F
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| see the answer see the solution |
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25)
In the reaction.
2Al(s) + 6HCl(s) → 2Al3+(aq) +
6Cl-(aq) + 3H2(g) ,
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1 )
6 L HClaq is consumed for every 3L H2(g) produced
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2 )
33.6 L H2(g) is produced regardless of temperature and pressure for every mole Al that reacts
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3 )
67.2 L H2(g) at STP is produced for every mole Al that reacts
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4 )
11.2 H2(g) at STP is produced for every mole HCl(aq) consumed
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| see the answer see the solution |
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26)
Regular use of which of the following fertilizer increases the acidity of soil ?
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1 )
Potassium nitrate
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2 )
Urea
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3 )
Superphosphate of lime
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4 )
Ammonium sulphate
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| see the answer see the solution |
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27)
Identify the correct statement regarding a spontaneous process
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1 )
For a spontaneous process in an isolated system, the change in entropy is positive
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2 )
Endothermic processes are never spontaneous
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3 )
Exothermic processes are always spontaneous
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4 )
Lowering of energy in the reaction process is the only criterion for spontaneity
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| see the answer see the solution |
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28)
Which of the following nuclear reactions will generate an isotope ?
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1 )
neutron particle emission
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2 )
positron emission
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3 )
α-particle emission
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4 )
β-particle emission
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| see the answer see the solution |
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29)
The equivalent conductances of two strong electrolytes at infinite dilution in H2O (where ions move
freely through a solution) at 25°C are given below:
∧°CH3COONa = 91.0 S cm2/equiv
∧°HCl = 426.2 S cm2/equiv
What additional information/quantity one needs to calculate ∧°
of an aqueous solution of acetic acid ?
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1 )
∧° of NaCl
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2 )
∧° of CH3COOK
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3 )
The limiting equivalent conductance of H+( ∧°H+)
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4 )
∧° of chloroacetic acid ( C/CH2COOH )
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| see the answer see the solution |
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30)
Which one of the following is the strongest base in aqueous solution ?
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1 )
Trimethylamine
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2 )
Aniline
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3 )
Dimethylamine
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4 )
Methylamine
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| see the answer see the solution |
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31)
The compound formed as a result of oxidation of ethyl benzene by KMnO4 is
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1 )
benzophenone
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2 )
acetophenone
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3 )
benzoic acid
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4 )
benzyl alcohol
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| see the answer see the solution |
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32)
The IUPAC name of  is
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1 )
1, 1-diethyl-2,2-dimethylpentane
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2 )
4, 4-dimethyl-5, 5-diethylpentane
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3 )
5, 5-diethyl-4, 4-diemthylpentane
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4 )
3-ethyl-4, 4-dimethylheptane
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| see the answer see the solution |
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33)
Which of the following species exhibits the diamagnetic behaviour ?
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1 )
O22-
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2 )
O2+
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3 )
O2
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4 )
NO
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| see the answer see the solution |
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34)
The stability of dihalides of Si, Ge, Sn and Pb increases steadily in the sequence
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1 )
GeX2 << SiX2 << SnX2 << PbX2
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2 )
SiX2 << GeX2 << PbX2 << SnX2
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3 )
SiX2 << GeX2 << SnX2 << PbX2
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4 )
PbX2 << SnX2 << GeX2 << SiX2
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| see the answer see the solution |
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35)
Identify the incorrect statement among the following :
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1 )
Ozone reacts with SO2 to give SO3.
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2 )
Silicon reacts with NaOH(aq) in the presence of air to give Na2SiO3 and H2O.
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3 )
Cl2 reacts with excess of NH3 to give N2 and HCl.
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4 )
Br2 reacts with hot and strong NaOH solution to give NaBr, NaBrO4 and H2O.
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| see the answer see the solution |
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36)
The charge/size ratio of a cation determines its polarizing power.
Which one of the following sequences represents the increasing order of the polarizing power
of the cationic species, K+, Ca2+, Mg2+, Be2+ ?
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1 )
Mg2+ < Be2+ < K+ < Ca2+
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2 )
Be2+ < K+ < Ca2+ < Mg2+
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3 )
K+ < Ca2+ < Mg2+ < Be2+
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4 )
Ca2+ < Mg2+ < Be2+ < K+
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| see the answer see the solution |
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37)
The density (in g mL-1) of a 3.60 M sulphuric acid solution that is 29%
H2SO4 (Molar mass = 98 g mol-1) by mass will be
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1 )
1.64
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2 )
1.88
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3 )
1.22
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4 )
1.45
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| see the answer see the solution |
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38)
The first and second dissociation constants of an acid H2A are
1.0×10-5 and 5.0×10-10 respectively.
The overall dissociation constant of the acid will be
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1 )
5.0 X 10-5
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2 )
5.0 X 1015
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3 )
5.0 X 10-15
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4 )
0.2 X 105
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| see the answer see the solution |
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39)
A mixture of ethyl alcohol and propyl alcohol as vapour pressure of 290 mm at 300 K.
The vapour pressure of propyl alcohol is 200 mm. If the mole fraction of ethyl alcohol is 0.6,
its vapour pressure (in mm) at the same temperature will be
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1 )
350
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2 )
300
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3 )
700
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4 )
360
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| see the answer see the solution |
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40)
In conversion of lime-stone to lime,
CaCO3(s) → CaO(s) + CO2(g)
The values of ΔH° and ΔS° are +179.1 kJ mol-1
and 160.2 J/K respectively at 298 K and 1 bar. Assuming that
ΔH° and ΔS° do not change with temperature, temperature
above which conversion of limestone to lime will be spontaneous is
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1 )
1008 K
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2 )
1200 K
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3 )
845 K
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4 )
1118 K
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| see the answer see the solution |
1 back to 1
ΔH = Ef-Eb
ΔH = 80-100 = -20
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2 back to 2
nFE°cell = -2.303 RT log(Zn2+/Cu2+)
=> 2×96500×1.10 = 2.303×8.314×298×log(Zn2+/Cu2+)
=> 37.3=log(Zn2+/Cu2+)
=> log(Zn2+/Cu2+) = 1037.3
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3 back to 3
Henderson-Hasselbalch equation:
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pH = pKa + log10
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[Conjugate Base]
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[Acid]
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pH = 4.5 + log10
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0.5c
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0.5c
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pH = 4.5
pOH = 14-4.5=9.5
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4 back to 4
A first order reaction has a rate proportional
to the concentration of one of the reactants.
In this case the rate of reaction is dependent on A and not
dependent on B.
So this is first order reaction.
So Rate = k[A][B]
=> mole/(liter.sec) = k(mole/liter)2
=> k = mole-1liter.sec-1
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5 back to 5
4f is shielded more than 5f
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6 back to 6
Rh(I), Ir(I), Pd(II), Pt(II), and Au(III) belongs to square planar geometry.
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7 back to 7
The asymmetric molecules that have no center, axis of symmetry rotates the plane of
polarized light.
The simplest type of asymmetric molecules (chiral molecule)is one which have four
different group attached to same carbon item.
Compound (1) does not have any plane of symmetry, so it is optically active.
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8 back to 8
Secondary structure in proteins consists α-helics and β-sheets structures.
These structures are formed as a result of H-bonding between different peptide groups.
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9 back to 9
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10 back to 10
This is a Carbylamine reaction.
The Carbylamine reaction is a chemical test for detection of primary amines
So the outputs are:
C2H5NC and 3KCl
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11 back to 11
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12 back to 12
If a group takes a negative charge by induction, the group possess
a -I effect.
If a group takes a positive charge by induction, the group possess
a +I effect.
If a group takes a negative charge by resonance, the group possess
a -R effect.
If a group takes a positive charge by resonance, the group possess
a +R effect.
-NO2 group in benzene ring shows -I and -R effect,
which deactivates the ring towards electrophilic substitution but
activates it towards nucleophilic substitution.
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13 back to 13
Bond order is the number of bonds between a pair of atoms.
Bond order= 1/2(number of bonding orbital - number of anti bonding orbital)
In C2, bond order=2 (diamagnetic)
In C2+, bond order=1.5 (paramagnetic)
In NO, bond order=2.5 (paramagnetic)
In NO+, bond order=3 (diamagnetic)
In O2, bond order=2 (diamagnetic)
In O2+, bond order=2.5 (paramagnetic)
In N2, bond order=3 (diamagnetic)
In N2+, bond order=2.5 (paramagnetic)
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14 back to 14
The actinoids exhibit more number of oxidation states than lanthanoids because
5f orbitals is further from the nucleus than the 4f orbitals.
So, 5f orbital electrons are held less strongly than the 4f orbital electrons.
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15 back to 15
In a mixture of ideal gases,
partial pressure is the pressure which the gas would have
if it would have alone occupied the volume.
The total pressure of a gas mixture is the sum of the partial pressures
of each individual gas in the mixture.
Molecular weight of methane (CH4) = 16
Molecular weight of oxygen (O2) = 32
Let weight of methane (CH4) = y
Let weight of oxygen (O2) = y
Total number of moles in gas mixture = y/16 + y/32 = 3y/32
Mole fraction of oxygen = (y/32)/(3y/32) = 1/3
So partial pressure exerted by oxygen = 1/3
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16 back to 16
An isotonic solution is a solution having the same osmotic
pressure as another with which it is compared.
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17 back to 17
H2O [liquid][(ng=0)] -----------> H2O [gas](ng=1)
Δng=1-0=1
ΔH = ΔU + ΔnRT
ΔU = 41 - 8.3×10-3×373
ΔU = 37.9 kJmole-1
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18 back to 18
Solubility constant (Ksp) = [Ag+ (aq)][IO3-(aq)]
1×10-8 = s2
=> s = 10-4 mole litre-1
Molecular weight of AgIO3 = 282.767
So s=282.767×10-4 gm litre-1
=> s=282.767×10-7 gm ml-1
=> s=2.83×10-3 gm 100ml-1
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19 back to 19
Half life of radioactive element
so, 30 = ln(2)/λ
=> λ = 0.023105
A = λN
Let initial activity is = A1
Let number of particles at initial stage = N1
Let permissible activity is = A2
Let number of particles at permissible stage = N2
A1/A2 = N1/N2
10 = N1/N2
N1 = 10N2
Nt = N0e-λt
N2 = N1e-λt
0.1 = e-0.023105t
ln 0.1 = -0.023105t
-2.3026 = -0.023105t
t = 100 days (approx.)
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20 back to 20
Chiral objects are not superposable on its mirror image.
Twisted boat is chiral as it does not have plane of symmetry.
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21 back to 21
Steric hindrance happens when the size of groups, within a molecule prevents the
chemical reactions that are observed in related smaller molecules.
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22 back to 22
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23 back to 23
The orbital that have highest value of (n + l) has higher energy.
(n+l) is highest for (n=3 and l=2)
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24 back to 24
The more the difference in electronegativity H and the other
electronegative atom, stronger is the bond.
Fluorine is the most electronegative element. So the HF bond is the strongest.
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25 back to 25
6 mole of HCl produces 3 mole of H2 gas.
So, 1 mole of HCl produces 0.5 mole of H2 gas.
Volume of 0.5 mole of H2 gas is 11.2 L.
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26 back to 26
x is a salt of strong acid and weak base.
In aqueous solution it produces ammonium ion. That increases the acidity of soil.
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27 back to 27
In an isolated system, a process is spontaneous if the change in entropy is positive.
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28 back to 28
Isotope have same number of protons but different numbers of neutrons.
So neutron particle emission will generate Isotope.
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29 back to 29
(Incomplete)
∧°CH3CO2Na =
λ°CH3CO2- +
λ°Na+
.............. (a)
∧°HCl = λ°H+ +
λ°Cl-
.................... (b)
Add (a) and (b)
∧°CH3CO2Na +
∧°HCl =
λ°CH3CO2- +
λ°Na+ +
λ°H+ +
λ°Cl-
=>
∧°CH3CO2Na +
∧°HCl =
λ°CH3CO2- +
λ°NaCl +
λ°H+
=>
∧°CH3CO2H
=
λ°CH3CO2- +
λ°H+
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30 back to 30
overall basic strength varies as
2° > 1° > 3°
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31 back to 31
In aliphatic compounds, carbon atoms are joined together in straight chains,
branched chains, or non-aromatic rings
Any aliphatic carbon with hydrogen attached to it, in combination with benzene ring, will be oxidized to
benzoic acid by KMnO4/H+
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32 back to 32
3-ethyl-4, 4-dimethylheptane
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33 back to 33
O22- = 18 σ1s2 σ*1s2
σ2s2 σ*2s2
σ2Pz2 ,
π2Px2
= π2Py2 ,
π*2Px2
= π*2Py2
Hence diamagnetic
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34 back to 34
Due to inert pair effect +2 oxidation state increases
as we move down this group in group 14.
So , SiX2 << GeX2 << SnX2 << PbX2
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35 back to 35
3Br2 + 6NaOH → 5NaBr + NaBrO3 + 3H2O
So 4 is incorrect
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36 back to 36
Greater the charge/size ratio of a cation, the mote is its polarizing power.
So 3 is correct
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37 back to 37
Molecular weight of H2SO4 = 98
Molarity of solution given = 3.6
So 1 liter of solution contains 3.6 moles of H2SO4
So 1 liter of solution contains 3.6×98 gm of H2SO4
Let the density of solution = D gm/ml
So 1000D gm of solution contains 3.6×98 gm of H2SO4
Now (3.6×98)/(1000D) = 0.29
So D = 1.2 gm/ml
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38 back to 38
K = K1×K1
=> K = 1.0×10-5 × 5.0×10-10
=> K = 1.0×10-15
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39 back to 39
As per Raoult's law:
Vapor pressure of an ideal solution is dependent on the
vapor pressure of each chemical component and the mole fraction
of the component present in the solution.
So, 290 = 200×0.4 + P×0.6
=> P = 350
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40 back to 40
ΔG = ΔH - TΔS = 0
=> ΔH = TΔS
=> T = 179.1/160.2 = 1118 (approx.)
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