Chemical Reaction Engineering - Practice Test

[#66] For the liquid phase zero order irreversible reaction A → B, the conversion of A in a CSTR is found to be 0.3 at a space velocity of 0.1 min -1 . What will be the conversion for a PFR with a space velocity of 0.2 min -1 ? (Assume that all the other operating conditions are the same for CSTR and PFR.)

(A) 0.15

(B) 0.30

(C) 0.60

(D) 0.90

Correct Answer

(C) 0.60

[#67] Molecularity of an elementary reaction, P + Q → R + S is

(A) 1

(B) 2

(C) 3

(D) 4

Correct Answer

(B) 2

Explanation

Solution: The molecularity of an elementary reaction represents the number of molecules or particles that come together to react and form the products. In the given elementary reaction: P + Q → R + S There are two reactant molecules (P and Q) that come together to form two product molecules (R and S). Therefore, the molecularity of this elementary reaction is 2 . So, the correct answer is Option B: 2 .

[#68] The fractional volume change between no conversion and complete conversion, for the isothermal gas phase reaction, 2A → R, is

(A) 0.5

(B) -0.5

(C) 1

(D) 1.5

Correct Answer

(B) -0.5

[#69] A catalyst in a chemical reaction

(A) Decreases the activation energy

(B) Alters the reaction mechanism

(C) Increases the frequency of collisions of reacting species

(D) All of the above

Correct Answer

(D) All of the above

[#70] For a __________ order reaction, the units of rate constant and rate of reaction are the same.

(A) Zero

(B) First

(C) Second

(D) Fractional

Correct Answer

(A) Zero

Chemical Reaction Engineering - Study Mode

Correct Answer

[#67] Molecularity of an elementary reaction, P + Q → R + S is

Correct Answer

Explanation

[#68] The fractional volume change between no conversion and complete conversion, for the isothermal gas phase reaction, 2A → R, is

Correct Answer

[#69] A catalyst in a chemical reaction

Correct Answer

[#70] For a __________ order reaction, the units of rate constant and rate of reaction are the same.

Correct Answer