ICSE ICSE Class 7 - CISCE Question Bank Solutions

The constituents of a mixture are present in a fixed ration.

Solutions are

State what information is provided by the formula of calcium hydroxide – Ca(OH)₂

Four atoms of hydrogen combine with one atom of carbon to give methane [CH₄]. State the valency of carbon.

Differentiate between a homogenous and a heterogeneous mixture with one example of each in the (a) solid-solid (b) solid-liquid If (c) liquid-liquid state of the mixture.

Select the correct answer from the choice in the bracket.

A homogenous mixture.

Give a reason for the following statement:

Gunpowder is an example of a heterogenous mixture.

In the Modern Periodic Table – atoms of all elements are arranged according to their increasing order of – atomic numbers. An atom of nitrogen has seven protons and seven electrons. State what would be its atomic number.

Name the cation and the anion in the salt – calcium sulphate

Give the symbol and valency of the following element and radical.

Potassium

Give the symbol and valency of the following element and radical.

Sodium

Give the symbol and valency of the following element and radical.

Hydrogen

Give the symbol and valency of the following element and radical.

Calcium

Give the symbol and valency of the following element and radical.

Aluminium

Give the symbol and valency of the following element and radical.

Magnesium

Give the symbol and valency of the following element and radical.

Zinc

Give the symbol and valency of the following element and radical.

Chlorine [Chloride]

Give the symbol and valency of the following element and radical.

Sulphur [Sulphide]

Give the symbol and valency of the following element and radical.

Nitrogen [Nitride]

Give the symbol and valency of the following element and radical.

Oxygen [Oxide]