(English Medium) ICSE Class 9 - CISCE Question Bank Solutions for Chemistry

Name the substance which makes water permanently hard.

State the disadvantages of using hard water.

Explain the permutit method for softening hard water.

Explain with equation, what is noticed when permanent hard water is treated with

Slaked time

Explain with equation, what is noticed when permanent hard water is treated with Washing soda.

Why group 17 elements are highly reactive?

What is the name given to group 17 elements? Why are they called so?

Arrange the following:

Elements of group 17, in decreasing order of reactivity

How will you distinguish between soft water and hard water?

How will you distinguish between temporary hard water and permanent hard water?

Differentiate between Temporary & permanent hard water with suitable examples.

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

Using given sample of temporary and permanent hard water, soft water, ordinary soap, detergent and washing soda how would you distinguish between hard and soft water?

Using given sample of temporary and permanent hard water, soft water, ordinary soap, detergent and washing soda how would you distinguish between temporary hard water and permanent hard water?

Using given sample of temporary and permanent hard water, soft water, ordinary soap, detergent and washing soda how would you remove temporary hardness from water without using a chemical compound?

Using given sample of temporary and permanent hard water, soft water, ordinary soap, detergent and washing soda how would you remove temporary hardness and permanent hardness from water using a chemical compound?

Using given sample of temporary and permanent hard water, soft water, ordinary soap, detergent and washing soda how would you prove the advantage of detergent over soap.

Fill in the blank:

Hard and soft water can be distinguished using _____.

Explain the meaning of the terms – hard water & soft water.

State the causes of hardness in water.