ICSE ICSE Class 7 - CISCE Question Bank Solutions for Chemistry

Briefly state the importance of Nitrogen.

Briefly state the importance of Carbon dioxide.

Briefly state the importance of Water vapour.

What do you understand by the term polluted air?

Name and briefly explain four ways by which pollution of air is caused by humans.

Name and briefly explain four ways by which pollution of air caused by humans is minimised.

What is the significance of water vapour in air?

Name three noble gases present in the air. State their one industrial use

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

Classify Water. Also give a balanced equation to prepare it.

Classify Carbon dioxide. Also give a balanced equation to prepare it.

Classify Calcium oxide. Also give a balanced equation to prepare it.

Classify Carbon monoxide. Also give a balanced equation to prepare it.

Complete and balance the following equation

CaO    +    H₂O    →

Fill in the blank space by choosing the correct word from the given list.

List: sulphurous, nitric acid, red lead oxide paint, oxygen, phosphoric

Sulphur dioxide gas dissolves in water to form ___________ acid.

Statement given below is incorrect. Write the correct statement :

Potassium nitrate on strong heating decomposes into potassium nitrite and nitrogen gas.

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

The catalyst used in laboratory preparation of oxygen gas from hydrogen peroxide gas is magnesium oxide

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

Enamelling is the process of baking a mixture of silicates on the surface of aluminium at a high temperature.

Tick (√ ) the most appropriate answer.

Magnesium burns with a dazzling white flame to form magnesium oxide, a powdery mass. The colour of magnesium oxide is :

Write fully balanced equation for the following :

CO₂  +  H₂O  →