Chemistry Test

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Chemistry Test - 14

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Weekly Quiz Competition

Question 1
1 / -0

Match the columns :

A
(A) – (c) / (B) – (e) / (C) – (a), (f) / (D) – (b), (d)

B
(A) – (c) / (B) – (a) / (C) – (a), (b) / (D) – (d), (f)

C
(A) – (a) / (B) – (e) / (C) – (c), (f) / (D) – (d)

D
(A) – (e) / (B) – (a) / (C) – (c), (f) / (D) – (d), (b)

Solution

(A) Zeolites can act as molecular sieves allowing smaller molecules and trapping larger molecules.

So, (A) - (c).

(B) Ethanol peptises cellulose nitrate to give so called "collodion".

Thus, (B) - (e).

(C) A micelle is a cluster of aggregated particles formed by associated colloids in solution. Sodium stearate [(a)] and cetyl trimethyl ammonium bromide [(f)] are examples of micelles.

So, (C) - (a), (f).

(D) Digestion of fat in the intestine is aided by emulsification [(b)]. The disinfectant "dettol" gives emulsion when mixed with water.

Thus, (D) - (b), (d).
Question 2
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If 5 g of a non-volatile solute in 100 g of water has a vapour pressure of 2980 Pa and the vapour pressure of pure water is 3000 Pa, the molar mass of the solute is

A
120 g mol–1

B
125 g mol–1

C
130 g mol–1

D
134 g mol–1

Solution

Mole fraction of water in solution is,
$x = \frac{(100 / 18) m o l}{(5 g / m) + (100 / 18) m o l}$
Hence, $P_{1} = x_{1} P_{1}$
$2980 P a = \frac{(100 / 18) m o l}{(5 g / m) + (100 / 18) m o l} (3000 P a)$
This gives M = 134.1 $m o l^{- 1}$
Question 3
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Which of the following statements regarding geometrical isomerism is true?

A
Geometrical isomers have the same physical and chemical properties.

B
Dipole moment of cis and trans isomers is the same.

C
Maleic acid and fumaric acid are geometrical isomers.

D
None of these

Solution

They both have the same geometrical formula and possess the structure as shown below:

Thus, we can infer that they are geometrical isomers.
Question 4
1 / -0

In which of the following stages does an explosion occur in the combustion chamber?

A
Intake stroke

B
Compression stroke

C
Power stroke

D
Exhaust stroke

Solution

A spark is produced at the TDC by spark plug, which ignites the compressed air-fuel mixture. This creates an explosion in the combustion chamber. This force gushes the piston towards BDC.
Question 5
1 / -0

The screening effect of s orbital electron is

A
greater than that of p, but lesser than that of d and f electrons

B
lesser than that of p, d and f electrons

C
greater than that of p, d and f electrons

D
equal to that of p, d and f electrons

Solution

Screening effect decreases in the order s > p > d > f.
Question 6
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Suppose that a sample of 100 g of water contains 0.025 g of chlorine. The concentration of chlorine in ppm will be

A
217 ppm

B
315 ppm

C
425 ppm

D
250 ppm

Solution
Question 7
1 / -0

Which of the following results in a decrease in entropy ?

A
Crystallisation of sucrose from solution

B
Rusting of iron

C
Conversion of ice into water

D
Vapourisation of camphor

Solution

Decrease in disorderliness would result in decrease in entropy.
Question 8
1 / -0

A
49

B
0.02

C
0.143

D
7

Solution
Question 9
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An aqueous solution of glucose is 10% in strength. What will be the volume in which 1 g mole of it is dissolved?

A
9 litre

B
1.8 litre

C
8 litre

D
0.9 litre

Solution

10% glucose solution means 10 g glucose is dissolved in 100 ml solution (it is assumed that solution is dilute and density of solution is equal to density of water).
1 g mole glucose = 180 g glucose
180 g glucose is dissolved in100/10 x 180 ml
= 1800 ml = 1.8 litre
Question 10
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Which among the following factors is the most important in making fluorine the strongest oxidising agent?

A
Electron affinity

B
Ionisation enthalpy

C
Hydration enthalpy

D
Bond dissociation energy

Solution

Fluorine is strongest oxidizing agent due to low heat of dissociation and high heat of hydration which have more than compensated the lower value of electron affinity.