Surface Chemistry Test

Result

Surface Chemistry Test - 59

Score
-
out of -
Rank
-
out of -

TIME Taken - -

SHARING IS CARING

If our Website helped you a little, then kindly spread our voice using Social Networks. Spread our word to your readers, friends, teachers, students & all those close ones who deserve to know what you know now.

Weekly Quiz Competition

Question 1
1 / -0

The graph of the effect of catalyst on activation energy is given below. Fill up the blanks $$X$$ and $$Y$$ with appropriate statements.

A
$$X =$$ energy of activation without catalyst, $$Y =$$ energy of activation with catalyst

B
$$X =$$ path of reaction with catalyst, $$Y =$$ path of reaction without catalyst

C
$$X =$$ energy of activation with catalyst, $$Y =$$ energy of activation without catalyst

D
$$X =$$ energy of endothermic reaction, $$Y =$$ energy of exothermic reaction

Solution

In the presence of a catalyst, the activation energy is reduced between reactant and product. The intermediate is formed faster in presence of catalyst followed by an alternate and short pathway. Hence, X would be energy of activation with catalyst and Y is the energy of activation without the catalyst.

Option C is correct.
Question 2
1 / -0

Which of the following factors are responsible for the increase in the rate of a surface catalyzed reaction?
(i) A catalyst provides proper orientation for the reactant molecules to react.
(ii) The heat of adsorption of reactants on a catalyst helps reactant molecules to overcome activation energy.
(iii) The catalyst increases the activation energy of the reaction.

A
(i) and (iii)

B
(i) and (ii)

C
(ii) and (iii)

D
(i), (ii) and (iii)
Solution
- Catalyst orients the molecules properly, so that reaction occurs
- The heat of adsorption of reactant molecules on a catalyst helps reactants to overcome the activation energy
- A catalyst increases the rate of reaction by decreasing the energy of activation.
- Hence (i) and (ii) are the correct options.
Question 3
1 / -0

Which is a characteristic of a catalyst?

A
It changes the equilibrium point

B
It initiates the reaction

C
It alters the rate of reaction

D
It increases the average kinetic energy of the molecule

Solution

Some properties of catalysts are:

1. A catalyst improves the speed of a reaction.

2. A catalyst takes part in the reaction even though it will not be consumed or used up in the course of the reaction.

3. A catalyst makes the reaction faster by giving an alternative path with lower activation energy.

4. In a reversible reaction, a catalyst accelerates the reaction in both directions. Therefore, the inclusion of a catalyst will not change the equilibrium point.

Thus the only the third statement is true.

The correct option is C.
Question 4
1 / -0

The volume of gases $${ H }_{ 2 },\ { CH }_{ 4 },\ { CO }_{ 2 }$$, and $${ NH }_{ 3 }$$ adsorbed by $$1 g $$ of charcoal at $$288K$$ are in the order:

A
$${ H }_{ 2 }> { CH }_{ 4 } > { CO }_{ 2 } > { NH }_{ 3 }$$

B
$${ CH }_{ 2 }> { CO }_{ 2 } > { NH }_{ 3 } > { H }_{ 2 }$$

C
$${ CO }_{ 2}>{ NH }_{ 3 } > { H }_{ 2 } > { CH }_{ 4 }$$

D
$${ NH }_{ 3 }> { CO }_{ 2 }>{ CH }_{ 4 } > { H }_{ 2 }$$

Solution

The amount of gas adsorbed by a solid depends on the nature of the gas. In general, easily liquefiable gases having higher critical temperatures are easily adsorbed because they have strong van der Waal's forces.

The increasing order of critical temperature is $$NH_3>CO_2>CH_4>H_2$$

The volume of gases $$H_2, CH_4, CO_2, NH_3$$ adsorbed by 1g of charcoal at 288K are in the order: $$NH_3>CO_2>CH_4>H_2$$.
Hence option D is correct.
Question 5
1 / -0

Which of the following statements about the catalyst is true?

A
A catalyst makes the reaction feasible by making $$\triangle G$$ more negative

B
A catalyst makes equilibrium constant more favourable for forward reaction

C
A catalyst accelerate rate of reaction by bringing down the activation energy

D
A catalyst always increases the rate of reaction

Solution

A catalyst is an agent used to accelerate the rate of reaction by decreasing activation energy as activation energy as activation energy is the barrier needed to be crossed by reactants to perform a reaction.
Question 6
1 / -0

The nature of colloidal solution of methylene blue and haemoglobin is _______ and ________ respectively.

A
positive, positive

B
negative, negative

C
positive, negative

D
negative, positive

Solution

The nature of colloidal solution depends upon the charge on particles of the dispersed phase and on the basis of that they are classified into positively or negatively charged.
Hemoglobin and methylene blue both are positively charged colloidal solutions.
Hence, option $$A$$ is correct.
Question 7
1 / -0

When $$ AgNO_3 (aq) $$ reacts with excess of iodine, we get :

A
$$ AgI$$

B
$$ HIO_3 $$

C
$$ AgO$$

D
$$HI $$
Question 8
1 / -0

Artificial smoke screens are made by

A
$$Al_{2}O_{3}$$

B
$$PbO$$

C
$$Na_{2}O$$

D
$$TiO_{2}$$
Question 9
1 / -0

Which of the following methods is used for sol destruction?

A
Condensation

B
Dialysis

C
Diffusion through animal membrane

D
Addition of an electrolyte

Solution

When an electrolyte is added to the sol, colloidal particles are neutralized by the adsorption of oppositely charged ions formed from the dissociation of the electrolyte.
These neutral particles will eventually get aggregated resulting in the formation of a precipitate.

Therefore the sol will be destroyed by the addition of an electrolyte.

Hence option D is correct.
Question 10
1 / -0

Adam's catalyst is

A
Platinum

B
Iron

C
Molybdenum

D
Nickel

Solution

User

Question Analysis

Correct -
Wrong -
Skipped -

My Perfomance

Score
-
out of -
Rank
-
out of -

Re-Attempt Weekly Quiz Competition

Surface Chemistry Test - 59

Result

Surface Chemistry Test - 59

Score

-

Rank

-

SHARING IS CARING

Question 1

$$X =$$ energy of activation without catalyst, $$Y =$$ energy of activation with catalyst

$$X =$$ path of reaction with catalyst, $$Y =$$ path of reaction without catalyst

$$X =$$ energy of activation with catalyst, $$Y =$$ energy of activation without catalyst

$$X =$$ energy of endothermic reaction, $$Y =$$ energy of exothermic reaction

Solution

Question 2

(i) and (iii)

(i) and (ii)

(ii) and (iii)

(i), (ii) and (iii)

Solution

Question 3

It changes the equilibrium point

It initiates the reaction

It alters the rate of reaction

It increases the average kinetic energy of the molecule

Solution

Question 4

$${ H }_{ 2 }> { CH }_{ 4 } > { CO }_{ 2 } > { NH }_{ 3 }$$

$${ CH }_{ 2 }> { CO }_{ 2 } > { NH }_{ 3 } > { H }_{ 2 }$$

$${ CO }_{ 2}>{ NH }_{ 3 } > { H }_{ 2 } > { CH }_{ 4 }$$

$${ NH }_{ 3 }> { CO }_{ 2 }>{ CH }_{ 4 } > { H }_{ 2 }$$

Solution

Question 5

A catalyst makes the reaction feasible by making $$\triangle G$$ more negative

A catalyst makes equilibrium constant more favourable for forward reaction

A catalyst accelerate rate of reaction by bringing down the activation energy

A catalyst always increases the rate of reaction

Solution

Question 6

positive, positive

negative, negative

positive, negative

negative, positive

Solution

Question 7

$$ AgI$$

$$ HIO_3 $$

$$ AgO$$

$$HI $$

Question 8

$$Al_{2}O_{3}$$

$$PbO$$

$$Na_{2}O$$

$$TiO_{2}$$

Question 9

Condensation

Dialysis

Diffusion through animal membrane

Addition of an electrolyte

Solution

Question 10

Platinum

Iron

Molybdenum

Nickel

Solution

User

Question Analysis

My Perfomance

Score

-

Rank

-

Results Announcement on: coming Monday

Stay Tuned: We’ll update you on your result via email or SMS.