Chemical Equilibrium

Q.

What are the three factors that affect gas pressure?

Q. The reaction in which yield of the products cannot be increased by the application of high pressure is:

1. $N_2\left(g\right)+3H_2\left(g\right)\rightleftharpoons 2N{H}_3\left(g\right)$
2. $2S{O}_2\left(g\right)+O_2\left(g\right)\rightleftharpoons 2S{O}_3\left(g\right)$
3. $N_2{O}_4\left(g\right)\rightleftharpoons 2N{O}_2\left(g\right)$
4. None of the above

Q.

Chemical equilibrium is attained in closed systems.

1. True

2. False

Q.

___are substances which alter the rates of chemical reactions without themselves undergoing any chemical change.

Q.

What is Meant by Dynamic Stability?

Q.

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

1. Concentration

2. Pressure

3. Temperature

4. Catalyst

Q.

What does it mean when equilibrium shifts to left?

Q. Reactions that take place both in forward and backward directions are called as reaction.

1. irreversible
2. reversible
3. exothermic

Q.

Which of the following is not a characteristic of chemical equilibrium?

1. Static in nature
2. Rate of forward = Rate of backward
3. ​Measurable properties become constant
4. Dynamic in nature

Q.

Chemical reactions that need energy in the form of electricity to take place are called electrochemical reactions.

1. True
2. False

Q. At equilibrium, the decrease in the concentration of a product favours ___________ reaction.

1. Reversible
2. No
3. Backward
4. Forward

Q.

A chemical reaction is said to be in equilibrium when -

1. of the conversion has taken place

2. only conversion of X to Y has taken place

3. the rate of transformation of X to Y is equal to the rate of transformation of Y to X in the system

4. there is change in the concentration of either x or y

Q. Explain why the following statements are not correct: [4 MARKS]
(a) Nitrogen can be obtained in the pure state by removing $C{O}_2$ and $O_2$ from air.
(b) Ammonium salts, on heating, give ammonia.

Q. The rate of the forward reaction is the rate of the backward reaction at dynamic equilibrium.

1. equal to
2. greater than
3. lesser than

Q.

Which of the following are the characteristics of equilibrium?

1. At equilibrium both the reactants and the products coexist
2. The rates of forward and backward reactions become equal at equilibrium
3. Chemical equilibrium is attained in closed systems
4. Chemical equilibrium is dynamic at the molecular level

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

4. It is dynamic at the molecular level.

Q. Reactions that take place both in forward and backward directions are called as reaction.

1. irreversible
2. reversible
3. exothermic

Q.

What do you mean by the term stoichiometric cofficient?

Q.

The factor/factors which will cause a shift in the chemical equilibrium is/are

1. A change in concentration of the reactant
2. A change in the pressure of the reacting system
3. A change in the temperature of the reacting system
4. A change in the concentration of the catalyst

Q.

Chemical equilibrium is attained in closed systems.

1. True

2. False

Q. Equilibrium in a closed system is ________________ in nature.

1. Dynamic
2. Static
3. Virtual
4. Moving

Q.

How do you represent equilibrium?

Q.

What is the equilibrium?

Q. ____________ changes always involve a change in the composition of substances.

1. Reversible
2. Man made
3. Chemical
4. Natural

Q.

The concentration of reactant keeps changing after a system has attained chemical equilibrium.

1. True

2. False

Q.

Which of the following is correct regarding a chemical reaction?

1. New substances are formed.

2. Chemical properties of matter change.

3. One substance reacts with another to undergo change in chemical composition.

4. All of the given options.

Q.

What influence does a decrease in reactant concentration have on the system which is in equilibrium?

1. Equilibrium will shift to increase the product concentration.

2. A forward reaction will be favored.

3. A backward reaction will be favored.

4. Equilibrium will shift to increase the reactant concentration.

Q.

Is growth a chemical process ? If yes, can it be represented as a chemical equation?

Q. In a closed system, no change in __________ can occur.

1. Energy
2. Mass
3. Pressure
4. Temperature

Q. The factors which will cause a shift in the chemical equilibrium are:

1. A change in concentration of the reactant
2. A change in the pressure of the reacting system
3. A change in the temperature of the reacting system
4. A change in the concentration of the catalyst