The vapour pressure of acetone at 20oC is 185 torr. When 1.2 g of a non-volatile substance was dissolved in
100 g of acetone at 20oC, its vapour pressure was 183 torr. The molar mass (g mol-1) of the substance is:
Answer
(A)
64
2
Which of the following compounds will exhibit geometrical isomerism?
Answer
(D)
1-Phenyl-2-butene
3
In Carius method of estimation of halogens, 250 mg of an organic compound gave 141 mg of AgBr. The
percentage of bromine in the compound is: (at. Mass Ag = 108; Br = 80)
Answer
(D)
24
4
The molecular formula of a commercial resin used for exchanging ions in water softening is
C8H7SO3Na (Mol. Wt. 206). What would be the maximum uptake of Ca2+ ions by the resin when expressed in mole per gram resin?
Answer
(B)
1/412
5
The following reaction is performed at 298 K
2NO(g) + O2 (g) $$\leftrightharpoons$$ 2NO2 (g)
The standard free energy of formation of NO(g) is 86.6 kJ/mol at 298 K. What is the standard free energy
of formation of NO2(g) at 298 K? (KP = 1.6 × 1012)
Answer
(C)
0.5[2×86,600 – R(298) ln(1.6×1012)]
6
The standard Gibbs energy change at 300 K for the reaction 2A $$\leftrightharpoons$$ B + C is 2494.2 J. At a given time,
the composition of the reaction mixture is [A] = 1/2, [B] = 2 and [C] = 1/2. The reaction proceeds in the: [R = 8.314 J/K/mol, e = 2.718]
Answer
(A)
reverse direction because Q > Kc
7
Two Faraday of electricity is passed through a solution of CuSO4. The mass of copper deposited at the
cathode is: (at. mass of Cu = 63.5 amu)
Answer
(A)
63.5 g
8
The intermolecular interaction that is dependent on the inverse cube of distance between the molecule is:
Answer
(C)
hydrogen bond
9
Which of the vitamins given below is water soluble?
Answer
(D)
Vitamin C
10
In the following sequence of reactions:
The product C is
Answer
(C)
C6H5CHO
11
The synthesis of alkyl fluorides is best accomplished by:
Answer
(C)
Swarts reaction
12
The number of geometric isomers that can exist for square planar [Pt (Cl) (py) (NH3) (NH2OH)]+ is (py = pyridine) :
Answer
(A)
3
13
In the following sequence of reactions:
The product C is
Answer
(C)
C6H5CHO
14
The synthesis of alkyl fluorides is best accomplished by:
Answer
(C)
Swarts reaction
15
The number of geometric isomers that can exist for square planar [Pt (Cl) (py) (NH3) (NH2OH)]+ is (py = pyridine) :
Answer
(A)
3
16
The colour of KMnO4 is due to :
Answer
(B)
L $$\to$$ M charge transfer transition
17
Which of the following compounds is not colored yellow?
Answer
(D)
Zn2[Fe(CN)6]
18
Assertion : Nitrogen and Oxygen are the main components in the atmosphere but these do not react to
form oxides of nitrogen.
Reason : The reaction between nitrogen and oxygen requires high temperature.
Answer
(A)
Both assertion and reason are correct, and the reason is the correct explanation for the assertion
19
Which one has the highest boiling point?
Answer
(C)
Xe
20
Higher order (>3) reactions are rare due to
Answer
(D)
low probability of simultaneous collision of all the reacting species
21
The ionic radii (in Å) of N3–, O2– and F– are respectively:
Answer
(B)
1.71, 1.40 and 1.36
22
Which of the following is the energy of a possible excited state of hydrogen?
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