ICSE ICSE Class 7 - CISCE Question Bank Solutions

Explain the term ‘atomicity’.

Give a reason why –

Helium is considered monoatomic, but hydrogen a diatomic molecule.

Give a reason why –

Ozone is considered triatomic, but phosphorus a tetratomic molecule.

State the atomicity of the following:

Neon

State the atomicity of the following:

Oxygen

State the atomicity of the following:

Chlorine

State the atomicity of the following:

Argon

State the atomicity of the following:

Sulphur

‘Dilute hydrochloric acid is added to sodium hydroxide’. Give a word equation and a molecular equation of the same. Is the equation written, a balanced equation. Give reasons.

Fill in the blank:

A molecule of an element is _________.

Fill in the blank:

The formula of aluminium sulphate is _________.

State the correct formula of the following from the option given:

Calcium hydroxide

State the correct formula of the following from the option given:

Sodium bisulphite

State the correct formula of the following from the option given:

Ammonium sulphate

State the correct formula of the following from the option given:

Aluminium phosphate

State the correct formula of the following from the option given:

Copper [II] nitrate

Name the following:

A molecule of a compound containing two oxygen atoms and one nitrogen atom.

Name the following:

The compound formed when iron [Fe²⁺] combines with oxygen [O²⁻].

Name the following:

A non-metal which forms a polyatomic molecule with more than three atoms.

 Fill in the blan

An ________ is a homogeneous mixture of two or more metals.