in the presence of a catalyst the heat evolved or absorbed

In the presence of a catalyst, the heat evolved or absorbed during the reaction _________.

A. increases

B. decreases

C. remains unchanged

D. may increase or decrease

Answer : remains unchanged

Solution :
Catalyst alters the activation energy of both forward and backward reactions equally hence heat of reaction remains unchanged.

Releted MCQ Question on
Physical Chemistry >> Chemical Kinetics

Releted Question 1

If uranium (mass number 238 and atomic number 92) emits an $$\alpha $$ -particle, the product has mass no. and atomic no.

A. 236 and 92

B. 234 and 90

C. 238 and 90

D. 236 and 90

View Answer

Releted Question 2

The rate constant of a reaction depends on

A. temperature

B. initial concentration of the reactants

C. time of reaction

D. extent of reaction

View Answer

Releted Question 3

The specific rate constant of a first order reaction depends on the

A. concentration of the reactant

B. concentration of the product

C. time

D. temperature

View Answer

Releted Question 4

A catalyst is a substance which

A. increases the equilibrium concentration of the product

B. changes the equilibrium constant of the reaction

C. shortens the time to reach equilibrium

D. supplies energy to the reaction

View Answer

In the presence of a catalyst, the heat evolved or absorbed during the reaction _________.

Releted MCQ Question on
Physical Chemistry >> Chemical Kinetics

If uranium (mass number 238 and atomic number 92) emits an $$\alpha $$ -particle, the product has mass no. and atomic no.

The rate constant of a reaction depends on

The specific rate constant of a first order reaction depends on the

A catalyst is a substance which

Practice More Releted MCQ Question on
Chemical Kinetics

Practice More MCQ Question on Chemistry Section

In the presence of a catalyst, the heat evolved or absorbed during the reaction _________.

Releted MCQ Question on Physical Chemistry >> Chemical Kinetics

If uranium (mass number 238 and atomic number 92) emits an $$\alpha $$ -particle, the product has mass no. and atomic no.

The rate constant of a reaction depends on

The specific rate constant of a first order reaction depends on the

A catalyst is a substance which

Practice More Releted MCQ Question on Chemical Kinetics

Practice More MCQ Question on Chemistry Section

Releted MCQ Question on
Physical Chemistry >> Chemical Kinetics

Practice More Releted MCQ Question on
Chemical Kinetics