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Q.

What will be the equation for the reaction which takes place when gas X reacts with lime water to form white precipitate Y.

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a

b

c

d

answer is A.

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Detailed Solution

Concept- A gas X that reacts with lime water to create a chemical Y is provided in the question.
Lime water, a solution of calcium hydroxide with the formula

, and carbon dioxide

gas react to generate a white precipitate that has the appearance of milk because of calcium carbonate

.
The precipitate dissolves when more carbon dioxide is added, forming a clear solution of calcium hydrogen carbonate.
So here,
Compound ‘X’ is carbon dioxide gas →

Compound ‘Y’ is calcium carbonate →

The chemical formula for the reaction that occurs

Hence, the correct answer is option 1).

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