ICSE ICSE Class 7 - CISCE Question Bank Solutions

Tick (√) the most appropriate answer.

Symbiotic bacteria is not present in the nodules of :

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The presence of water vapour in air is essential for :

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Which is not a polluting gas for the air?

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The humans pollute the air by :

Briefly state the importance of Oxygen.

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.