ICSE ICSE Class 7 - CISCE Question Bank Solutions

Explain the term ‘atomicity’.

A radical take part – unsplit in a chemical reaction and retains its identity in reactions.
With reference to the radical –

1. ammonium
2. bisulphate
3. carbonate

state the group of atoms present in each radical.

‘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 _________.

Select the correct answer to the statement given below:

The basic unit of matter is not capable of independent existence.

Select the correct answer to the statement given below:

The smallest particle of a substance – capable of independent existence and which retains the characteristics of the substance.

Select the correct answer to the statement given below:

Imaginary path around the nucleus of an atom in which electrons revolve.

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.

What does 2C0₂ represent ?

What does 2H₂S  represent ?

What does 5H₂S0₄ represent ?

What does 6NaNO₃ represent ?