ICSE ICSE Class 7 - CISCE Question Bank Solutions

State and explain two ways by which air gets polluted in nature.

What happens when potassium nitrate is heated ?

What happens when Sodium burns in oxygen ? Also give the balanced chemical equation for the reaction.

What happens when Iron burns in oxygen ? Also give the balanced chemical equation for the reaction.

Fill in the blank space by choosing the correct word from the given list.
List: sulphurous, nitric acid, red lead oxide paint, oxygen, phosphoric

To prevent rusting, the underside of the ships is coated with __________________.

Write ‘True’ or ‘False’ in front of following statement.

The rust formed on the surface of iron easily crumbles. 

Tick (√ ) the most appropriate answer.

Galvanising is the process of coating iron with a layer of molten :

How will you prove that oxide formed by burning sodium is basic in nature?

Write fully balanced equation for the following :

MgO   +   H₂O   →

What is rusting?

State two most important conditions for rusting.

State four ways of preventing rusting.

Write the balanced chemical equation of the manganese dioxide.

With reference to the following metals state their use in daily life metal:

copper

With reference to the following metals state their use in daily life metal:

iron

With reference to the following metals state their use in daily life metal:

Aluminium

With reference to the following metal state its use in daily life:

Magnesium

With reference to the following metals state their use in daily life metal:

Zinc

With reference to the following metals state their use in daily life metal:

Lead

With reference to the following metals state their use in daily life metal:

Silver