Surface Chemistry Test

Result

Surface Chemistry Test - 63

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Weekly Quiz Competition

Question 1
1 / -0

Following reaction is catalysed by $$Br^- (aq)$$
$$2 H_2O_2 (aq) \rightarrow 2 H_2O (l) + O_2 (g)$$
This is an example of

A
homogeneous catalysis

B
heterogeneous catalysis

C
autocatalysis

D
enzyme catalysis
Question 2
1 / -0

The most suitable reagent for given conversion is

A
Diimide

B
$$H_{2}/Ni_{2}B$$

C
$$Zn/dil.HCl$$

D
$$LiAlH_{4}$$
Question 3
1 / -0

In which name reaction incorrect regents is/ are given?

A
HVZ reaction $$\rightarrow $$ Red phosphorous $$+{Cl}_{2}$$

B
Etard reaction $$\rightarrow Cr{O}_{2}{Cl}_{2}+{CS}_{2}$$

C
Hofmann degradation reaction $$\rightarrow {Br}_{2}+KOH$$

D
Perkin reaction $$\rightarrow {({CH}_{3}CO)}_{2}O+{CH}_{3}COONa$$

E
Finkelstein reaction $$\rightarrow SO{Cl}_{2}+$$ pyridine
Question 4
1 / -0

The phrase 'hot dilute soup', was used by

A
Oparin

B
Darwin

C
Haldane

D
None of these

Solution
Question 5
1 / -0

Which of the following is not considered as adsorption?

A
Extraction of noble gases by charcoal

B
Sponge placed in water

C
Finely divided charcoal stirred in dilute acetic acid

D
Decolourisation of sugar by animal charcoal
Question 6
1 / -0

Adsorption of a gas follows the equation $$\frac{x}{m}=kP^{1/2}$$
Then the effect of pressure & temperature on physical adsorption of gas on solid is:

A
increase with pressure increase, decrease with temperature increase

B
increase with both temperature & pressure increase

C
decrease with pressure increase, increase with temperature increase

D
decrease with both temperature & pressure increase.

Solution

Solution:- (A) Increase with pressure increase, decrease with temperature increase
Physical adoption increase on increasing pressure but decreases on increasing temperature.
Question 7
1 / -0

For the conversion of oxygen to ozone in the atmosphere, nitric oxide in gaseous phase acts as:

A
enzyme catalyst

B
inhibitor

C
homogeneous catalyst

D
heterogeneous catalyst

Solution

When the reactants, products and the catalyst are in the same phase (i.e., liquid or gas), the process is said to be homogeneous catalysis.

Since oxygen and nitric oxide are both in the gas phase, so nitric oxide acts as a homogeneous catalyst.

Hence, option $$C$$ is correct.
Question 8
1 / -0

The enthalpy of adsorption in physisorption lies in the range

A
$$- (40 - 400) kJ/mol$$

B
$$- (80 - 240) kJ/mol$$

C
$$- (20 - 40) kJ/mol$$

D
$$- (1 - 10) kJ/mol$$

Solution
Question 9
1 / -0

When a chalk stick is dipped in ink, then

A
the colored pigments in the ink get absorbed in the chalk.

B
the solvent get adsorbed at the surface of chalk.

C
inside of the chalk will remain as white while the surface will have colored pigments.

D
inside of the chalk will have colored pigments while the surface will remain white.

Solution
Question 10
1 / -0

Chromatography is a technique based on:

A
Solubilities of solute

B
Adsorption of solute

C
Chemical adsorption followed by dispersion

D
Differential adsorption of different constituents of a mixture

Solution