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

Name and state the following with reference to the elements of the first three periods of the periodic table.

Noble gas with duplet arrangement of electrons.

Name and state the following with reference to the elements of the first three periods of the periodic table.

Noble gas having electronic configuration: 2, 8, 8.

Name and state the following with reference to the elements of the first three periods of the periodic table.

Group whose elements have zero valencies.

Name the alkali metals, How many electron(s) they have in their outermost orbit.

Take any one alkali metal and write its reaction with (i)oxygen (ii)water (iii)acid.

Name the method by which alkali metals can be extracted.

Name the first three alkaline earth metals.

Write the reactions of the first three alkaline earth metals with dilute hydrochloric acid.

How do alkaline earth metals occur in nature?

Write the electronic configuration of the first two alkaline earth metals.

How many electrons do inert gases have in their valence shells?

Comment on the (i) reactivity (ii) colour (iii) physical state of group 17 elements.

Name the gas used in:

Filling balloons

Name the gas used in:

Light bulbs

Name the gas used in:

Bright colour advertising light works

 Give reason:

Alkali metals are kept in an inert solvent.

 Give reason:

Alkali metals and halogens do not occur free in nature.

 Give reason:

Alkali and alkaline earth metal compounds usually form electrovalent compounds.

 Give reason:

Inert gases do not form compounds.

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