Chemical Reaction Engineering MCQ Questions & Answers

11

In Langmuir treatment of adsorption,

A) Whole surface of the catalyst does not have the same activity for adsorption and there is attraction between the adsorbed molecule B) Whole surface of the catalyst is essentially uniform and the adsorbed molecule has no effect on the rate of adsorption per site C) All the adsorption does not take place by the same mechanism D) Extent of adsorption is more than one complete monomolecular layer on the surface

Discuss

Answer & Solution

Answer: Option B

No explanation is given for this question. Let's Discuss on Board

12

If C_A is the quantity of reactants initially present, the quantity left after 'n' half periods will be equal to

A) $${\left( {\frac{{{{\text{C}}_{\text{A}}}}}{2}} \right)^{\text{n}}}$$ B) $${\left( {\frac{1}{2}} \right)^{\text{n}}} \cdot {{\text{C}}_{\text{A}}}$$ C) $${\left( {\frac{{{{\text{C}}_{\text{A}}}}}{2}} \right)^{\frac{1}{{\text{n}}}}}$$ D) $${\left( {{{\text{C}}_{\text{A}}}} \right)^{\frac{1}{{2{\text{n}}}}}}$$

Discuss

Answer & Solution

Answer: Option B

No explanation is given for this question. Let's Discuss on Board

13

Pick out the correct statement.

A) A catalyst does not change AH of the reaction B) A catalyst changes the equilibrium point C) Law of mass action was suggested by Le-Chatelier D) The difference between the energy of reactants and that of the products is the activation energy

Discuss

Answer & Solution

Answer: Option A

No explanation is given for this question. Let's Discuss on Board

14

Cold shot cooling is only practical when the feed temperature is __________ than the reaction temperature.

A) Higher B) Much higher C) Lower D) Much lower

Discuss

Answer & Solution

Answer: Option D

No explanation is given for this question. Let's Discuss on Board

15

With an increase in pressure in gaseous phase chemical reactions, the fractional conversion __________ when the number of moles decreases.

A) Increases B) Decreases C) Remains unaffected D) Unpredictable from the data

Discuss

Answer & Solution

Answer: Option A

No explanation is given for this question. Let's Discuss on Board

16

The rate of forward reaction, at chemical equilibrium is____the rate of backward reaction.

A) More than B) Less than C) Equal to D) Either B or C

Discuss

Answer & Solution

Answer: Option C

No explanation is given for this question. Let's Discuss on Board

17

An endothermic second order reaction is carried out in an adiabatic plug flow reactor. The rate of heat generation is

A) Maximum at the inlet of the reactor B) Maximum at the exit of the reactor C) Maximum at the centre of the reactor D) Constant throughout the reactor

Discuss

Answer & Solution

Answer: Option A

No explanation is given for this question. Let's Discuss on Board

18

In chamber process of sulphuric acid manufacture in industry, the gas phase oxidation of SO₂ to SO₃ is accomplished by a __________ reaction.

A) Non-catalytic homogeneous B) Non-catalytic heterogeneous C) Catalytic homogenous D) Catalytic heterogeneous

Discuss

Answer & Solution

Answer: Option C

No explanation is given for this question. Let's Discuss on Board

19

For the chemical reaction X → Y, it is observed that, on doubling the concentration of 'X', the reaction rate quadruples. If the reaction rate is proportional to C_xⁿ, then what is the value of 'n'?

A) 4 B) $$\frac{1}{4}$$ C) 16 D) 2

Discuss

Answer & Solution

Answer: Option A

Solution:

Step 1: Understanding the given information.

The reaction given is X → Y, and it follows the rate equation:

Rate = k * C_xⁿ

It is observed that when the concentration of 'X' is doubled, the reaction rate quadruples.

Step 2: Setting up the rate equation.

Let the initial concentration of 'X' be C_x. The initial rate is:

Rate₁ = k * (C_x)ⁿ

When the concentration is doubled, the new rate is:

Rate₂ = k * (2C_x)ⁿ

Step 3: Establishing the relationship.

Since it is given that the reaction rate quadruples:

Rate₂ = 4 * Rate₁

Substituting the expressions:

k * (2C_x)ⁿ = 4 * (k * (C_x)ⁿ)

Step 4: Solving for 'n'.

Dividing both sides by k * (C_x)ⁿ:

(2C_x)ⁿ / (C_x)ⁿ = 4

2ⁿ = 4

Since 4 = 2², we get:

n = 2

Final Answer: The value of 'n' is 2.

The correct answer is Option D: 2.

20

Pick out the wrong statement.

A) Visible radiation provides the necessary activation energy in photochemical reactions B) The order and molecularity of a complex reaction may not be the same C) For a second order reaction, the slope of the graph/plot between rate and (concentration) is equal to the rate constant (k) D) Molecularity of the reaction is always a whole number greater than zero

Discuss

Answer & Solution

Answer: Option B

No explanation is given for this question. Let's Discuss on Board

Chemical Reaction Engineering MCQ Questions & Answers | Chemical Engineering