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The s-Block Elements

Long Answer Type

131.

What happens when:
(i) sodium metal is dropped in water?
(ii) sodium metal is heated in free supply of air?
(iii) sodium peroxide dissolves in water?

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Short Answer Type

132.

Write balanced equation for reactions between:
Na₂O₂ and water

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133.

Write balanced equation for reactions between:
KO₂ and water

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134.

Write balanced equation for reactions between:
Na₂O and CO₂.

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135.

Account for the following:
(i) Sodium imparts colour to the flame.
(ii) Sodium acts as a strong reducing agent.

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136.
Name a few important uses of sodium ?

It is used:
(i) in sodium vapour lamps.

(ii) as a coolant in the valves of internal combustion engines and in nuclear reactions.

(iii) in drying organic solvents such as benzene to remove even last traces of moisture.

(iv) as a reagent for the detection of nitrogen, sulphur and halogens in the organic compounds.

(v) in sodium amalgam which is used as a reducing agent in organic synthesis.

(vi) in the preparation of sodium compounds such as Na₂O₂, NaCN, NaNH_2.
(vii) in the manufacture of a sodium-lead alloy which is used in the manufacture of tetraethyl lead which is added to petrol as an antiknock compound.