ICSE ICSE Class 8 - CISCE Question Bank Solutions

Write the molecular formulae of Iron (II) sulphide.

Write the molecular formulae of Lead (II) oxide – PbO.

Write the molecular formulae of Hydrogen nitrate (nitric acid).

Write the molecular formulae of Hydrogen sulphate (sulphuric acid).

Write the molecular formulae of Calcium hydroxide.

Write the molecular formulae of Magnesium carbonate.

Write the molecular formulae of Ammonium carbonate.

Why is sea water salty ?

Discuss the importance of water as a solvent for our body .

Discuss the importance of water as a solvent for plants.

What do you mean by solubility of a solute in a solvent ?

Give a reason why water is called a ‘universal solvent’ but, an alkali is not.

Give a reason why boiled water tastes flat.

Select the correct answer of the following statement:

The medium of dissolution which allows the solute to dissolve in it.

Explain the term ‘variable valency’.

Copper having electronic configuration 2,8,18,1 exhibits variable valency. Give a reason for the same and name the compound CuCI and CuCl₂.

Explain the term ‘symbol’.

With reference to water and ammonia as compounds respectively, state the valency of oxygen and nitrogen.

Write the chemical formula of the following compound in a step-by-step manner –

Potassium chloride

Write the chemical formula of the following compound in a step-by-step manner –

Sodium bromide