ICSE ICSE Class 8 - CISCE Question Bank Solutions for Chemistry

Answer the following question:

Name two gases dissolved in natural water.

What do you mean by water pollution ?

What are its causes and how can water pollution be controlled ?

Name the products formed when:

wood is burnt in the absence of air.

Name the products formed when:

bone is heated in the absence of air.

Give balanced chemical equations to show the reaction between Coke and steam.

Give balanced chemical equations to show the reaction between Magnesium and water.

Give two uses for  the following:

wood charcoal

Give two uses for the following:

sugar charcoal

 How will you collect the gas ?

Write the balanced chemical equation for the above reaction.

Write the balanced chemical equations for the preparation of carbon dioxide by: 

the action of acetic acid on sodium bicarbonate.

Write the balanced chemical equations for the preparation of carbon dioxide by:

the action of dilute sulphuric acid on sodium bicarbonate.

What happens when carbon dioxide is passed through lime water first in small amounts and then in excess ?

What happens when a baking mixture containing baking powder is heated?

Give reason for the following:

Soda acid and foam types of fire extinguisher are not used for extinguishing electrical fires.

Give reason for the following:

Solid carbon dioxide is used for refrigeration of food.

What is a fire extinguisher ? What is the substance used in the modern type of fire extinguishers ? How is it an improvement over the soda acid-type and the foam-type fire extinguishers ?

Explain the term ‘green house effect’. How can it be both beneficial and harmful for life on earth ?

What steps should be taken to balance carbon dioxide in the atmosphere ?