Electrolysis

Q. Question 11

Electrolysis of water is a decomposition reaction. The mole ratio of hydrogen and oxygen gases liberated during electrolysis of water is

(a) 1:1
(b) 2:1
(c) 4:1
(d) 1:2

Q.

Nail polish remover contains?

1. Acetone

2. Acetic acid

3. Petroleum

4. Benzene

Q.

During the chlor - alkali process, which gas is liberated at anode and cathode respectively?

1. Anode : H₂ , Cathode : Cl₂

2. Anode : Cl₂ , Cathode : H₂

3. Anode : O₂ , Cathode : H₂

4. Anode : O₂ , Cathode : Cl₂

Q.

On electrolysis of dilute sulphuric acid using platinum electrodes, the product obtained at the anode will be

1. Hydrogen

2. Oxygen

3. Hydrogen sulphide

4. Sulphur oxide

Q.

What are the main constituents of Dettol and its uses?

Q.

In electrolysis, oxidation takes place at ___

1. Anode

2. Cathode

3. Both anode and cathode

4. None of the above

Q.

Why is tap water a good conductor of electricity?

Q.

Is NaCl an electrolyte?

Q.

Why does the solution of magnesium chloride conduct electricity?

Q. The diagram given below is the apparatus for electrolysis of water. Identify A, B and C.

1. A - Oxygen, B - Hydrogen, C - Platinum plates
2. A - Hydrogen, B - Oxygen, C - Copper plates
3. A - Oxygen, B - Hydrogen, C - Copper plates
4. A - Hydrogen, B - Oxygen, C - Platinum plates

Q.

During the electrolysis of acidified water, where would oxygen and hydrogen gas be liberated?

1. Oxygen is liberated at anode, hydrogen is liberated at cathode
2. Oxygen is liberated at cathode, hydrogen is liberated at anode
3. Both are liberated at cathode
4. Both are liberated at anode

Q. How is impure copper purified by electrolysis? Explain.

Q. The decomposition of an electrolyte by electric current is called as .

1. conduction
2. electrolysis
3. reduction

Q. The process of breaking a substance into its respective ions when electricity is passed through its aqueous solution is known as ____.

1. Segregation
2. Electrolysis
3. Dissociation
4. Separation

Q.

An electrolyte

1. Forms complex ions in solution

2. Gives ions only when electricity is passed

3. Possesses ions even in solid state

4. Gives ions only when dissolved in water

Q. When sodium chloride ($\text{NaCl}$) is dissolved in water, then ${\text{Na}}^{+}$ and ${\text{Cl}}^{-}$ ions are attracted to the atoms of water molecule. Identify the corresponding atoms to which they attract to from the given options.

1. ${\text{Na}}^{+}$: Hydrogen
   ${\text{Cl}}^{-}$: Oxygen
2. ${\text{Na}}^{+}$: Oxygen
   ${\text{Cl}}^{-}$: Hydrogen
3. ${\text{Na}}^{+}$: Hydrogen
   ${\text{Cl}}^{-}$: Hydrogen
4. ${\text{Na}}^{+}$: Dihydrogen oxide
   ${\text{Cl}}^{-}$: Hydrogen

Q. Question 2
Why does an aqueous solution of acid conduct electricity?

Q. How do ions conduct electricity in aqueous medium?give exampe.

Q.

Dry pellets of base X when kept in open absorb moisture and turn sticky. The compound is also formed by chlor-alkali process. Write chemical name and formula of X. Describe chlor-alkali process with a balanced chemical equation. Name the type of reaction that occurs when X is treated with dilute hydrochloric acid. Write the chemical equation. While diluting an acid, why is it recommended that the acid should be added to water and not water to the acid?

Q.

Write the equation for the laboratory preparation of:

Sodium sulfate using sulphuric acid.

Q.

It is told that acids conduct electricity in their aqueous solution due to the presence of ions. Do bases also conduct electricity due to the presence of hydroxyl ions?

Q. In the electrolysis of water-(3 marks)
(i) Name the gas collected at the cathode and respectively.
(ii) Why is the volume of gas collected at one electrode double than that at the other
(iii) Given distinguishing tests for the gases evolued.

Q.

State two uses each of the following compounds :

(a) Sodium hydroxide

(b) Chlorine

(c) Hydrogen

(d) Hydrochloric acid

Q.

What is the common name of $\mathrm{NaOH}$?

Q.

what are the uses of ketone and aldehyde in everyday life

Q.

Question 64
An element A burns with golden flame in air. It reacts with another element B, atomic number 17 to give a product C. An aqueous solution of product C on electrolysis gives a compound D and liberates hydrogen. Identify A, B, C and D. Also write down the equations for the reactions involved.

Q.

When the concentrated aqueous solution of substance X is electrolysed, then $NaOH,C{l}_{2}and{H}_2$ are produced. Name the substance X. What is the special name of this process?

Q.

Question 23
An electrolytic cell consists of:
(i) positively charged cathode.
(ii) negatively charged anode.
(iii) positively charged anode.
(iv) negatively charged cathode.

(a) (i) and (ii)
(b) (iii) and (iv)
(c) (i) and (iii)
(d) (ii) ad (iv)

Q.

The products of chlor-alkali process are :

(a) $NaCl,C{l}_{2}and{H}_2$

(b) $H_2,C{l}_{2}andNaOH$

(c) $C{l}_2,N{a}_{2}C{O}_{3}and{H}_{2}O$

(d) $NaOH,C{l}_{2}andHCl$

Q. Explain why the blue color remains blue during electrolysis of $CuS{O}_4$ solution using copper electrodes?