ICSE ICSE Class 8 - CISCE Question Bank Solutions

Define the Hard water.

Name the compound responsible for temporary hardness.

Name the compound responsible for permanent hardness of water.

Suggest one method for the removal along with the reaction for temporary hardness.

Suggest one method for the removal along with the reaction for permanent hardness of water.

Name three water borne diseases.

Boiling removes the ................ hardness of water.

Temporary hardness of water can be removed by

Differentiate between Hard & soft water with suitable examples.

Differentiate between Temporary & permanent hard water with suitable examples.

Give balanced equation to show how temporary hardness enters into water.

Give balanced equation to show how temporary hardness in water can be removed by boiling.

Give balanced equations to show how permanent hardness in water can be removed by addition of washing soda.

Give reason for the following:

Hardness in temporary water can be removed by boiling, but hardness in permanent hard water cannot.

Give reason for the following:

Washing soda can be used to remove both temporary and permanent hardness in water.

How do the solubility of a solid and a gas affected by Increase in temperature.

Give two examples of Drying agent.

Give two example of Solvent other than water.

Give reason for Table salt becomes moist during rainy season.

Why is sea water salty ?