ICSE ICSE Class 7 - CISCE Question Bank Solutions

State why telegraph poles are painted with aluminium paint.

Give a reason why a green deposit is seen on the surface of an article of copper

Give a reason why iron objects rust easily but the iron pillar at Qutab Minar has not rusted over the years.

State a specific reason for using copper in electrical cables

Name the following:

The most reactive halogen.

Name the following:

A metal used in packaging.

Name the following:

The chemical compound responsible for the green deposit on the surface of articles of copper.

Name the following:

A metal used in flexible pipes.

Name the following:

A halogen which is a solid at room temperature.

State the utility of carbon dioxide for manufacture of food by plants.

State its role in warming the earth’s environment and in excess resulting in global warming.

State the utility of –
(a) Water vapour
(b) Rare or inert gases present in the air.

Give the environment effect of three polluting gases with a reason why nitrogen is not considered a polluting gas.

Define:- Atom

Define:- Molecule

Define:- Radicals

Write the names of the elements present in the following compound.

Common salt

Write the names of the elements present in the:- 

Ammonia

Write the names of the elements present in the :- 

Sulphuric acid

Write the names of the elements present in the:- 

Glucose