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Q.

Salt ‘A’ commonly used in bakery products on heating gets converted into another salt ‘B’ which itself is used for removal of hardness of water and a gas ‘C’ is evolved. The gas ‘C’ when passed through lime water, turns it milky. Identify A.

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a

b

c

d

Both 1 and 2

answer is A.

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Detailed Solution

Concept- Lime water is a calcium hydroxide (

) saturated solution. Calcium hydroxide reacts with carbon dioxide to form the precipitate of calcium carbonate and water.
Thus, lime water turns milky due to the formation of an insoluble suspension of calcium carbonate.
As the gas evolved turns lime water milky, that means the gas C is carbon dioxide (

)
Now, it is known that the salt commonly used in bakery products is sodium bicarbonate. The molecular formula for sodium bicarbonate is

.
Thus, A is sodium bicarbonate -

.
The salt A on heating gets converted into salt B and gas C.
Sodium bicarbonate on heating undergoes a decomposition reaction. During the reaction, products formed are sodium carbonate which is a salt, carbon dioxide gas and water.
The molecular formula for sodium carbonate is

, for carbon dioxide is

and for water is

. Thus, B is sodium carbonate -

and C is carbon dioxide -

.
Hence, the correct option is (1).

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Salt ‘A’ commonly used in bakery products on heating gets converted into another salt ‘B’ which itself is used for removal of hardness of water and a gas ‘C’ is evolved. The gas ‘C’ when passed through lime water, turns it milky. Identify A.