Catalysis

Q.

How does a Catalyst Work?

Q.

A catalytic poison renders the catalyst ineffective because

1. It’s preferentially adsorbed on catalyst

2. It adsorbs the molecules of reactants

3. It reacts chemically with the catalyst

4. It reacts with one reactant

Q. Electron deficient molecular hydride is:

1. $N{H}_3$
2. $C{H}_4$
3. $B_2{H}_6$
4. $P{H}_3$

Q.

A catalyst is a substance which [NCERT 1981; CPMT 1996

1. Alters the equilibrium in a reaction

2. Is always in the same phase as the reactants

3. Participates in the reaction and provides easier pathway for the same

4. Does not participate in the reaction but speeds it up

Q.

A catalyst is a substance [IIT 1983]

1. Increases the equilibrium concentration of the product

2. Changes the equilibrium constant of the reaction

3. Shortens the time to reach equilibrium

4. Supplies energy to the reaction

Q. Which of the following statements is/are correct about solid catalysts?

1. Same reactants may give different products by using different catalysts.
2. A catalyst does not change $\Delta H$ of a reaction.
3. A catalyst is required in large quantities to catalyse the reaction.
4. Catalytic activity of a solid catalyst does not depend upon the strength of chemisorption.

Q.

A catalyst is a substance which [NCERT 1981; CPMT 1996

1. Alters the equilibrium in a reaction

2. Is always in the same phase as the reactants

3. Participates in the reaction and provides easier pathway for the same

4. Does not participate in the reaction but speeds it up

Q.

A catalyst is used [CPMT 1989]

1. Only for increasing the velocity of the reaction

2. For altering the velocity of the reaction

3. Only for decreasing the velocity of the reaction

4. All (a), (b) and (c) are correct

Q.

When is heated, it decomposes into . If some is added, the reaction goes much faster because

[CPMT 1971, 76, 80, 94]

1. 
2. 
3. 
4. 

Q. Choose the statements which are true among the following.

1. A catalyst reduces the rate of a reaction
2. A promoter increases the rate of a reaction
3. A poison reduces the activity of a catalyst
4. Enzymes are biocatalysts