Chemical Equilibrium in Reversible Reactions

Q.

A chemical change cannot be normally reversed. Why?

Q.

The insoluble substance formed during a chemical reaction is known as a precipitate.

1. True
2. False

Q.

A reaction involving two different reactants can never be __________

Q.

In which of the following reaction can equilibrium be attained?

1. (a) Reversible reaction

2. (b) Irreversible reaction

3. (c) Redox Reaction

4. (d) Single Displacement Reaction

Q.

When the system $\mathrm{A}+\mathrm{B}\rightleftharpoons \mathrm{C}+\mathrm{D}$ is at equilibrium?

1. the forward reaction has stopped.

2. both the forward and the reverse reactions have stopped.

3. the reverse reaction has stopped.

4. neither the forward nor the reverse reaction has stopped.

Q.

Two different atoms or groups of atoms (ions) are exchanged in ________ reactions.

Q.

___is the stage at which the rate of the forward reaction becomes equal to the rate of the backward reaction in a chemical reaction.

1. None of these

2. Physical equilibrium

3. Chemical equilibrium

4. Dynamic equilibrium

Q.

Heating limestone at a temperature of 1070 K we get________.

Q.

During the formation of ferric thiocyanate and potassium nitrate from ferric nitrate and potassium thiocyanate, the red color is due to the formation of

1. $Fe(CNS{)}_2^{+}$

2. $Fe(CNS{)}^{2+}$

3. $Fe(CNS{)}_3$

4. $Fe(CNS{)}^{2-}$

Q.

Give one word for the following :

Chemical reactions in which heat is absorbed

Q. Identify the type of chemical reaction given below.
$\mathrm{NaOH}\left(\mathrm{aq}\right)+\mathrm{HCl}\left(\mathrm{aq}\right)\to \mathrm{NaCl}\left(\mathrm{aq}\right)+H_{2}O\left(l\right)$

1. Combination reaction
2. Displacement reaction
3. Decomposition reaction
4. Double displacement reaction

Q. Burning of coal is a combination reaction.

1. True
2. False

Q.

A lady is planning to white wash her house. She bought 10 kg of quicklime from the market and dissolved it in 30 litres of water. On adding lime in water she noticed that the water started boiling without being heated. Give reasons for her observation. Write the corresponding equations and name the products formed.

Q.

What happens in the reaction involving different reactants?

Q.

Which types of reactions are represented by the chemical equation $\mathrm{CaO}\left(\mathrm{s}\right)+{\mathrm{CO}}_2\left(\mathrm{g}\right)\to {\mathrm{CaCO}}_3\left(\mathrm{s}\right)$.

Q.

Why lime water turn milky when carbon dioxide is passed through it?

Q.

In which of the following reactions heat energy is absorbed?

1. Combustion of coal

2. The reaction of barium hydroxide with ammonium chloride

3. On dissolving ammonium chloride in water

4. Both b and c

Q. Passage of nitrogen and oxygen through electric arc is an example of :

1. catalytic reaction
2. thermite process
3. reversible reaction
4. catalytic recation

Q. Which of the following is a characteristic of a reversible reaction?

1. The number of moles of reactants and products are equal
2. It can be influenced by a catalyst
3. It can never proceed to completion
4. It can be attained in an open vessel

Q.

The new substance produced in a reaction are called _________.

Q.

The chemical reaction in which the products formed react together to form the original reactants is known as___________.

1. irreversible reaction
2. catalytic reaction
3. neutralization reaction
4. reversible reaction

Q. Which of the following is a reversible reaction?

1. $KCl{O}_3$ is heated in a sealed tube.
2. $N{a}_{2}C{O}_3$ is heated in a closed vessel.
3. $CaC{O}_3$ is heated in a closed vessel.
4. $C{H}_4$ is heated with excess of $O_2$ in a closed vessel.

Q. I: After a system has reacted chemical equilibrium, there is no change in the concentrations of reactants and products.
II: Reactions are not reversible at equilibrium.

Q. A reversible reaction is one which:

1. Proceeds in both direction
2. Proceeds spontaneously
3. Proceeds in one direction
4. All the statements are wrong

Q.

Which of the following is/are example(s) of reversible reaction?

1. Formation of ammonia from nitrogen and hydrogen
2. Thermal decomposition of hydrogen chloride
3. Passage of nitrogen and oxygen through electric arc
4. All of the above

Q. Necessary condition for a reversible reaction is:

1. It should occur in a closed container
2. None of the products is allowed to form a precipitate
3. It should always be accompanied in the presence of a catalyst
4. All of the above.

Q. Select the correct statement which is an example of a chemical change that is reversible.

1. Melting of wax
2. Butter getting rancid
3. Reaction of sodium chloride with water
4. Reaction of hydrogen with iodine

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. what is equilibrium state and steady state

Q. In a reversible chemical reaction equilibrium is said to have been established when the:

1. opposing reactions cease
2. speeds of opposing reactions become equal
3. temperatures of opposing reactions are equal
4. concentration of reactants and produces are equal