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

State the electrode reaction at the anode during electrolysis of:
very dilute sulphuric acid.

State the electrode reaction at the anode during electrolysis of:
sodium chloride solution.

State the electrode reaction at the anode during electrolysis of:
Fused lead bromide.

State the electrode reaction at the anode during electrolysis of:
magnesium chloride (molten).

Give reason for the following:

Electrolysis of molten lead bromide is considered to be a reaction in which oxidation and reduction go side by side, i.e., a redox reaction.

Give reason for the following:

Lead bromide undergoes electrolytic dissociation in the molten state but is a non-electrolyte in the solid state.

Give reason for the following:

Aluminium is extracted from its oxide by electrolytic reduction and not by convectional reducing agents.

Give reason for the following:

The ratio of hydrogen and oxygen formed at the cathode and anode is 2 : 1 by volume.

Give reason for the following:

In the electrolysis of acidified water, dilute sulphuric acid is preferred to dilute nitric acid for acidification.

State the position of the following in the periodic table:

Alkali metals

Give reason for the following:

Ammonia is unionised in the gaseous state but in the aqueous solution, it is a weak electrolyte.

State the position of the following in the periodic table:

Alkaline earth metals

State the position of the following in the periodic table:

Iron and zinc

Give reason for the following:

A graphite anode is preferred to other inert electrodes during the electrolysis of fused lead bromide.

State the position of the following in the periodic table:

Aluminium

Give reason for the following:

Carbon tetrachloride is a liquid but does not conduct electricity.

Give the general characteristics of:

Alkali metals,

(i) bonding
(ii) action of air
(iii) action of water
(iv) action of acid

Write down the word or phrase from the bracket that will correctly fill in the blank in the following sentence:
Pure water consists entirely of ________________ (ions/ molecules).

Give the general characteristics of:

Alkaline earth metals with reference to

(i) bonding
(ii) action of air
(iii) action of water
(iv) action of acid

Write down the word or phrase from the bracket that will correctly fill in the blank in the following sentence:
We can expect that pure water ________________ (will / will not) normally conduct electricity.