(English Medium) ICSE Class 10 - CISCE Question Bank Solutions for Chemistry

State the electrode reaction at the anode during electrolysis of:
Aqueous copper sulphate solution.

Give reason for the following:

The blue colour of aqueous copper sulphate fades when it is electrolysed using platinum electrodes.

Give reason for the following:

For electroplating with silver, silver nitrate is not used as an electrolyte.

Give three applications of electrolysis.

Explain the term:

Electro refining

How is impure copper purified by electrolysis ? Explain.

List out the main applications of electrolysis.

The following question relate to the electroplating of an article with silver.
Name the electrode formed by the article which is to be plated.

The following question relate to the electroplating of an article with silver.
What ions must be present in the electrolyte?

The following question relate to the electroplating of an article with silver.
 What should be the nature of the anode?

The following questions are about electroplating of copper wire with silver.
(a) What ions must be present in the electrolyte?
(b) Of what substance must the anode be made up of?
(c) What will the cathode be made up of?
(d) Write the equation for the reaction which takes place at the cathode.

Element X is a metal with valency 2. Element Y is a non-metal with valency 3.
(a) Write equations to show how X and Y form ions.
(b) If Y is diatomic gas, write the equation for the direct combination of X and Y to form a compound.
(c) Write two applications of electrolysis in which anode diminish in mass.
(d) If the compound formed between X and Y is melted and an electric current passed through the molten compound, the element X will be obtained at the _____ and the Y at the ________of the electrolytic cell. (Provide the missing words).

What ions must be present in a solution used for electroplating a particular metal?

A solution of silver nitrate is a good electrolyte but is not used for electroplating an article with silver.

Mr Ramu wants electrolyte his key chain with nickel to prevent rusting. For this electroplating
(i) Name the electrolyte
(ii) Name the cathode
(iii) Name the anode
(iv) Give the reaction at the cathode
(v) Give the reaction at the anode

The electrolyte used for electroplating an article with silver is ______.

Copy and complete the following table :

Draw a labelled diagram to show how iron is electroplated with copper.

Which solution is preferred as electrolyte, CuSO₄ or FeSO₄?

Describe what happens to the iron object and the copper rod.