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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 ?

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Long Answer Type

137.

Discuss in brief the Solvay process for the manufacture of washing soda.

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138.

Discuss the various reactions which occur in the Solvay ammonia process.

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Short Answer Type

139.
List some important uses of washing soda (sodium carbonate).

Important uses of washing soda:

1. It is used in the manufacture of glass, caustic soda, borax and soap powders.
2. It is used for softening water.
3. It is used in industries like textile, paper, petroleum, refining, paints etc.
4. It is used in laundries as washing soda.
5. It is used as a laboratory reagent.

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