Previous Year Papers

Download Solved Question Papers Free for Offline Practice and view Solutions Online.

Test Series

Take Zigya Full and Sectional Test Series. Time it out for real assessment and get your results instantly.

Test Yourself

Practice and master your preparation for a specific topic or chapter. Check you scores at the end of the test.

The s-Block Elements

Long Answer Type

121.

Discuss the extraction of lithium.

117 Views

Short Answer Type

122.

What difficulties arise in the extraction of lithium?

109 Views

Long Answer Type

123.

What happens when:
(i) Lithium reacts with air
(ii) Lithium reacts with water
(iii) Lithium reacts with halogen
(iv) Lithium reacts with acids?

98 Views

Short Answer Type

124.

Account for the following:
(i) Lithium can not form monovalent cation (Li⁺) easily.
(ii) Lithium iodide is more covalent than lithium fluoride.

123 Views

125.

Name a few important uses of lithium.

103 Views

126.

How does sodium occur in nature? Name the chief ores of sodium.

139 Views

Long Answer Type

127.

What difficulities arise in the extraction of sodium? How these difficulties are overcome?

114 Views

128.

Discuss Down's process for the isolation of sodium.

167 Views

Short Answer Type

129.
Why is sodium kept under kerosene oil?

Sodium cannot be kept in the air because its surface gets tarnished due to the formation of a layer of its oxide, hydroxide and carbonate on its surface.

Sodium cannot be kept in water because it reacts with water violently and hydrogen evolved catches fire.

Therefore, sodium is kept in kerosene oil.

171 Views

130.

What happens when:
(i) sodium reacts with hydrogen halide,
(ii) sodium reacts with acetylene,
(iii) sodium is heated with hydrogen and
(iv) sodium is treated with mercury ?

139 Views