ICSE ICSE Class 8 - CISCE Question Bank Solutions

Define the term ‘valency’.

State a reason why the symbol of calcium is ‘Ca’ and of copper is ‘Cu’

Give a reason – Magnesium [2, 8, 2] has valency 2+.

State the valency of the following metallic element and write symbol with the valency
Potassium

State the valency of the following metallic element and write symbol with the valency
Sodium

State the valency of the following metallic element and write symbol with the valency
Calcium

State the valency of the following metallic element and write symbol with the valency
Magnesium

State the valency of the following metallic element and write symbol with the valency
Zinc

State the valency of the following metallic element and write symbol with the valency
Aluminium

State the valency of the following metallic element and write symbol with the valency
Chromium

Certain metal exhibit variable valencies which include valencies: 1+, 2+, 3+, and 4+.
State the variable valency of the following metal.
Copper
write symbol with the variable valency

Certain metal exhibit variable valencies which include valencies: 1+, 2+, 3+, and 4+.
State the variable valency of the following metal.
Silver
write symbol with the variable valency

Certain metal exhibit variable valencies which include valencies: 1+, 2+, 3+, and 4+.
State the variable valency of the following metal.
Mercury
write symbol with the variable valency

Certain metal exhibit variable valencies which include valencies: 1+, 2+, 3+, and 4+.
State the variable valency of the following metal.
Iron
write symbol with the variable valency

Certain metal exhibit variable valencies which include valencies: 1+, 2+, 3+, and 4+.
State the variable valency of the following metal.
Tin
write symbol with the variable valency

Certain metal exhibit variable valencies which include valencies: 1+, 2+, 3+, and 4+.
State the variable valency of the following metal.
Lead
write symbol with the variable valency

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).

Chloride

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).

Bromide

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).

Iodide

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).

Nitrate