Reactions Due to Catalyst

Q.

What is perhydrol?

Q.

A substance which increases or decreases the rate of a chemical reaction.

Q.

What is the difference between endothermic reaction and endothermic process ?

Q.

What happens when we increase the temperature of reaction system?

1. Increases the rate of reaction

2. Lowers the rate of reaction

3. The reactants dry out

4. Has no effect on rate of reaction

Q.

Is pepsin a digestive enzyme?

Q.

What is the role of catalyst in the activation energy of a chemical reaction?

1. Lowers the activation energy

2. None of the choices

3. Provide alternative route for the chemical reaction to proceed

4. Both the choices

Q.

Are enzymes always active?

Q. Is there a positive or a negative promoter which is added to the catalyst ?

Q. What is the catalyst used in the decomposition of Hydrogen Peroxide?

1. $F{e}_2{O}_3$
2. $V_2{O}_5$
3. $Mn{O}_2$
4. Anything can be used

Q.

Pancreatic enzymes work best in an_______ medium.

Q.

The catalyst used in $4N{H}_3+5O_2⟶4NO+6H_{2}O$ is___________.

1. $Fe$
2. $Mn$
3. $Pt$
4. $V_2{O}_5$

Q.

What is Haber's process?

1. only
2. only CO
3. both CO and
4. All the above

Q.

The catalyst used in the reaction $2S{O}_2+O_2⟷2S{O}_3$ is__________.

1. $V_2{O}_5$
2. $Mn{O}_2$
3. $Pt$
4. $Fe$

Q. Peter is evaluating two cases given below.
Case 1: Hammering of iron sheet to bend it
Case 2: Melting of wax
Identify the cause of change in both the cases.

1. Case 1: Force
   Case 2: Force
2. Case 1: Force
   Case 2: Temperature
3. Case 1: Temperature
   Case 2: Force
4. Case 1: Temperature
   Case 2: Temperature

Q.

Reactions in which energy is absorbed, usually in the form of heat are known as ___ reactions.

1. Neutralisation

2. Photochemical

3. Exothermic

4. Endothermic

Q.

The reactions which involve the use of catalysts are known as _____.

1. reversible reactions
2. irreversible reactions
3. catalytic reactions
4. none of the above

Q. What is the catalyst used in the preparation of sulphur trioxide from sulphur dioxide?

1. $F{e}_2{O}_3$
2. $V_2{O}_5$
3. $Pt$
4. Mn

Q. Catalysts alter the rate of a chemical reaction.

1. False
2. True

Q. Which of the following processes does not involve a catalyst?

1. Thermite process
2. Ostwald's process$(HN{O}_3$)
3. Contact process
4. Haber's process

Q. The catalytic converter in a car contains which of the following catalyst to serve as a catalyst to change carbon monoxide, which is toxic, into carbon dioxide?

1. Sulphuric acid
2. Platinum
3. Hydrogen peroxide
4. Enzymes

Q. What is the catalyst used in the preparation of ammonia?

1. $H_2$
2. Fe
3. Pt
4. Pd

Q. When nitrogen reacts with hydrogen under high temperature and pressure, ammonia, which is also a gas is formed. This is an example of:

1. chemical combination
2. chemical decomposition
3. physical change
4. None of these

Q. A phenomenon during the course of chemical reaction in which some substance is formed which acts as a catalyst is known as :

1. positive catalysts
2. negative catalysts
3. auto catalysts
4. poisonous catalysts

Q.

In the reaction $2H_2{O}_2⟶2H_{2}O+O_2$, the catalyst used is____________.

1. $Mn{O}_2$
2. $MgO$
3. $Fe$
4. $M{n}_2{O}_3$

Q. Define the term - 'catalyst':

1. increases the rate of reaction.
2. decreases the rate of reaction.
3. can increase or decrease the rate of reaction.
4. none of these

Q. ___ are substances that fasten the rate of the reaction without undergoing any permanent change themselves.

Q. A negative catalyst the rate of a reaction.

1. increases
2. decreases
3. maintains

Q. Positive catalysts increases the rate of reaction.

1. False
2. True

Q. The chemical reaction in which heat energy is released is known as _______ reaction.

1. endothermic
2. exothermic
3. displacement
4. both a and b

Q. The rate of a reaction by the addition of a catalyst ___________ .

1. increases
2. remains same
3. decreases
4. all of the above