ICSE ICSE Class 8 - CISCE Question Bank Solutions

State whether the following ion or radical given below of a non-metallic element exhibits valency: 1^–, 2^– or 3^–. (write the ion or radical with the correct valency).

Hydroxide

State whether the following ion or radical given below of a non-metallic element exhibits valency: 1^–, 2^– or 3^–. (write the ion or radical with the correct valency).

Bicarbonate

State whether the following ion or radical given below of a non-metallic element exhibits valency: 1^–, 2^– or 3^–. (write the ion or radical with the correct valency).

Bisulphite

State whether the following ion or radical given below of a non-metallic element exhibits valency: 1^–, 2^– or 3^–. (write the ion or radical with the correct valency).

Bisulphate

State whether the following ion or radical given below of a non-metallic element exhibits valency: 1^–, 2^– or 3^–. (write the ion or radical with the correct valency).

Aluminate

State whether the following ion or radical given below of a non-metallic element exhibits valency: 1^–, 2^– or 3^–. (write the ion or radical with the correct valency).

Permanganate

State whether the following ion or radical given below of a non-metallic element exhibits valency: 1^–, 2^– or 3^–. (write the ion or radical with the correct valency).

Oxide

State whether the following ion or radical given below of a non-metallic element exhibits valency: 1^–, 2^– or 3^–. (write the ion or radical with the correct valency).

Sulphide

State whether the following ion or radical given below of a non-metallic element exhibits valency: 1^–, 2^– or 3^–. (write the ion or radical with the correct valency).

Sulphite

State whether the following ion or radical given below of a non-metallic element exhibits valency: 1^–, 2^– or 3^–. (write the ion or radical with the correct valency).

Sulphate

State whether the following ion or radical given below of a non-metallic element exhibits valency: 1^–, 2^– or 3^–. (write the ion or radical with the correct valency).

Carbonate

State whether the following ion or radical given below of a non-metallic element exhibits valency: 1^–, 2^– or 3^–. (write the ion or radical with the correct valency).

Dichromate

State whether the following ion or radical given below of a non-metallic element exhibits valency: 1^–, 2^– or 3^–. (write the ion or radical with the correct valency).

Zincate

State whether the following ion or radical given below of a non-metallic element exhibits valency: 1^–, 2^– or 3^–. (write the ion or radical with the correct valency).

Plumbite

State whether the following ion or radical given below of a non-metallic element exhibits valency: 1^–, 2^– or 3^–. (write the ion or radical with the correct valency).

Phosphate

State whether the following ion or radical given below of a non-metallic element exhibits valency: 1^–, 2^– or 3^–. (write the ion or radical with the correct valency).

Nitride

Complete the statement given below by filling in the blanks with the correct words.

From the elements – He, Br, Pt and O; the element which forms a polyatomic molecule is ________ and which is liquid at room temperature is ________.

Differentiate between direct combination reaction and a decomposition reaction.

Classify the following reaction into – 

1. Direct combination 
2. Decomposition
3. Displacement
4. Double decomposition

The reaction is – Zinc hydroxide on heating gives zinc oxide and water.

Give a balanced equation for –

A thermal decomposition reaction involving heat on limestone [calcium carbonate]