ICSE ICSE Class 6 - CISCE Question Bank Solutions for Chemistry

Name the following

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

If ‘X’ g. of potassium nitrate is added to 100 g. of water at 60°C and the salt dissolves completely then :

(a) is ‘X’ g. the solubility of potassium nitrate at 60°C.
(b) is the solution formed – saturated or unsaturated
(c) if on addition ‘X’ + ‘Y’ g. of potassium nitrate to the same amount of water at the same temperature and the solute now just remains behind after stirring then –
(d) is the solution now – saturated or unsaturated
(e) is ‘X’ + ‘Y’ g. the solubility of potassium nitrate.

State whether the following statement is true or false. If false write the correct statement.
Solubility of most solids – decreases with increase in temperature

Define the term solute.

Define the term – solvent

Why are the symbols and formulae of substances important?

Define Crystallisation

Explain the term – molecules. Give three examples of atoms of the same element forming a molecule. State the atomicity of the same.

Give one example of a triatomic molecule

Give one example of a polyatomic molecule.

State the principle involved in separation of solid-solid mixtures by sieving

Explain the term ‘sieving’. State the structure of a sieve and explain the separation of different sized particles by sieving.

Draw a neat labelled diagram for the separation of the following mixture.

Coarse sand from fine sand

State the technique involved in separating the following:

Rice powder from soil particles

State the technique involved in separating the following:

Large diamonds from very small diamonds

Give reasons for the following:

Two varieties of wheat flour cannot be separated by sieving.

Give reasons for the following:

Both components of a soluble solid-liquid mixture cannot be recovered by evaporation.

Why are the symbols and formulae of substances important?

Explain the term – molecules. Give three examples of atoms of the same element forming a molecule. State the atomicity of the same.

Give one example of a triatomic molecule