ICSE ICSE Class 7 - CISCE Question Bank Solutions

In the laboratory preparation of oxygen from hydrogen peroxide answer the following:

Draw a neat labelled diagram for the method used in the above preparation.

In the laboratory preparation of oxygen from hydrogen peroxide answer the following:

Name the catalyst used in the preparation and state it’s function.

In the laboratory preparation of oxygen from hydrogen peroxide answer the following:

State the word equation for the reaction involving the above preparation of oxygen.

In the laboratory preparation of oxygen from hydrogen peroxide answer the following:

State the method of collection of the oxygen gas giving reasons.

Distinguish between:

Combustion and Respiration

Distinguish between:

Combustion & Rusting with suitable word equations only?

Give the main experimental points only to demonstrate that magnesium.

Give the main experimental points only to demonstrate that candle-gains weight on burning.

Give reason for the following:

Acid rain has caused damage to heritage structures such as the Taj Mahal.

Give reason for the following:

Combustion and respiration show similarity.

Name the following:

The pollutant which combines with water vapour to give sulphuric acid – a product of acid rain.

Name the following:

The gas required for both combustion and rusting.

Define physical change. Give two examples for the above changes.

What are reversible and irreversible changes ? Give one example for each.

Is burning a physical change or a chemical change? Why?

A burning candle shows both physical and chemical changes. Explain ?

State three differences between evaporation and boiling

State four differences between physical and chemical changes.

What do you observe when :

lighted match stick is brought near the mouth of the test tube containing hydrogen gas.

Name a chemical change which takes place in presence of: