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

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?

Both temporary & permanent hardness in water can be removed by addition of washing soda. Give balanced equations for the same.

State what are synthetic detergents. Explain experimentally how you will determine the advantage of synthetic detergents over soap using a sample of hard water.

Select the correct answer from the choice given in the options.

A substance which causes hardness in water _____.

Name or state the following:

A substance added to remove both temporary and permanent hardness in water.

State the characteristics which remain similar in moving down in a group of the periodic table.

Write a short note on the following type of element –

alkali metals

Write a short note on the following type of element –

alkaline earth metals

Write a short note on the following type of element –

halogens

Write a short note on the following type of element –

noble gases

‘The periodic table contains elements methodically grouped together’.

State the main helpful features of the long form of the periodic table.

Name or state following with reference to the element of the first three periods of the periodic table.

An alkaline earth metal in period 3.

Select the correct answer from the options given below.

The most reactive halogen from group 17.

Give a reason for the following:

Noble gases do not form compounds readily.

Give a reason for the following:

Group 1 [I – A] elements are called alkali metals.

State the following:

The group from the groups 1 [IA], 2 [IIA], 16 [VIA] and 7 [VIIA] whose elements are most electronegative.

State the following:

The group whose elements are unreactive or inert.