ICSE ICSE Class 8 - CISCE Question Bank Solutions

Define of Molecular formula.

Write the molecular formula for the oxide and sulphide of following elements of Sodium.

Write the molecular formula for the oxide and sulphide of following elements of Calcium

Write the molecular formula for the oxide and sulphide of following elements of Hydrogen

Write the molecular formulae for the following compounds and name the elements present of  Baking soda.

Write the molecular formulae for the following compounds and name the elements present of  Common salt.

Write the molecular formulae for the following compounds and name the elements present of Sulphuric acid 

Write the molecular formulae for the following compounds and name the elements present of Nitric acid.

The valency of aluminium is 3. Write the valency of other radicals present in the following compound.

Aluminium chloride

The valency of aluminium is 3. Write the valency of other radicals present in the following compounds of Aluminium oxide.

The valency of aluminium is 3. Write the valency of other radicals present in the following compounds of Aluminium nitride

The valency of aluminium is 3. Write the valency of other radicals present in the following compounds of Aluminium sulphate.

What is variable valency ? Give two examples of elements showing variable valency.

A solution of a substance ‘X’ is used for white washing.
(a) Name the substance ‘X’ and write its formula.
(b) Write the reaction of the substance ‘X’ named in (a) above with water.

How do the solubility of a solid and a gas affected by Increase in temperature.

Give two examples of Drying agent.

Give two example of Solvent other than water.

Give reason for Table salt becomes moist during rainy season.

Write the molecular formulae of  Iron (III) chloride

Write the molecular formulae of Sodium hydroxide