Catalyst and Chemical Equilibrium

Q.

Balance the following chemical equation . (a). ZnS+O2-ZnO+SO2

Q.

In a reversible reaction, the role played by a catalyst is to

1. increase the rate of the forward reaction only

2. increase the rate of the forward and the backward reaction to the same extent.

3. not affect the rate of either of the reactions.

4. increase the rate of backward reaction only

Q.

Select the correct statement regarding the influence of catalyst on chemical equilibrium.

1. The catalyst causes a shift in chemical equilibrium.

2. The catalyst increases the reactant concentration.

3. The catalyst increases the product concentration.

4. The catalyst helps the system to reach chemical equilibrium faster.

Q.

Why does equilibrium happen?

Q.

What is equilibrium and its condition?

Q.

Reactions taking place in both directions are called ___.

1. reversible reactions

2. forward reactions

3. backward reactions

4. irreversible reactions

Q.

If "catalysts don't take part in chemical reactions and only change the rate of reaction " , the why during catalytic oxidation of alkanes, we get different products using Cu, MoO and when no catalyst is used?

Q. A reversible reaction is:

1. the reaction in which reactants are converted in to products
2. the reaction in which products are converted in to reactants
3. catalyst is essential
4. none of these

Q.

Consider the given system in equilibrium:

$2S{O}_2\left(g\right)+O_2\left(g\right)\leftrightharpoons 2S{O}_3\left(g\right)+heat$

What effect will addition of vanadium pentoxide have on the given equilibrium system?

1. A backward reaction will be favored.

2. The new reaction mixture will contain more of sulphur trioxide.

3. A forward reaction will be favored.

4. There won't be any effect on the equilibrium system.

Q.

Identify the common property for a chemical reaction at dynamic equilibrium.

1. The measurable properties like concentration, density, colour, pressure, etc., remain constant at constant temperature.

2. The forward and backward reactions take place with the same rate.

3. It can be achieved from both directions.

4. All of the above.

Q. For a reversible system, what happens when the volume of the reacting system in equilibrium is increased:

1. 
   

2. 
   

3. 
   

4. 
   

Q.

In a reversible reaction, the role played by a catalyst is to

1. increase the rate of the forward reaction only

2. increase the rate of backward reaction only

3. increase the rate of the forward and the backward reaction to the same extent.

4. not affect the rate of either of the reactions.

Q.

Consider the given system in equilibrium:

$2S{O}_2\left(g\right)+O_2\left(g\right)\leftrightharpoons 2S{O}_3\left(g\right)+heat$

What effect will addition of vanadium pentoxide have on the given equilibrium system?

1. A forward reaction will be favored.

2. A backward reaction will be favored.

3. The new reaction mixture will contain more of sulphur trioxide.

4. There won't be any effect on the equilibrium system.

Q.

The factor which does not cause a shift in chemical equilibrium is:

1. temperature

2. catalyst

3. pressure

4. concentration

Q. In a reversible reaction, a catalyst

1. 
   

2. 
   

3. 
   

4. un predictable

Q. Which reactions never go to completion?

1. Irreversible
2. Reversible
3. Instantaneous
4. Spontaneous

Q. A reversible reaction never go for completion.
If true enter 1, if false enter 0.

Q.

Select the correct statement regarding the influence of catalyst on chemical equilibrium.

1. The catalyst causes a shift in chemical equilibrium.

2. The catalyst increases the reactant concentration.

3. The catalyst increases the product concentration.

4. The catalyst helps the system to reach chemical equilibrium faster.

Q. (a) Define chemical equilibrium. [1 mark]
(b) A chemical equilibrium is an example of a dynamic equilibrium. Justify. [1 mark]

Q.

In a reversible reaction, the role played by a catalyst is to

1. increase the rate of the forward reaction only

2. increase the rate of backward reaction only

3. increase the rate of the forward and the backward reaction to the same extent.

4. not affect the rate of either of the reactions.

Q.

Choose the incorrect statement regarding chemical equilibrium from the statements given below.

1. Reactants and products co-exist at chemical equilibrium.

2. Concentration of reactant changes after a system has attained equilibrium.

3. It is dynamic at the molecular level.

4. The rate of forward reaction is equal to the rate of backward reaction.