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Question

Answer the question by selecting the appropriate option given below:

Assertion (A): The gas produced during the reaction of sodium carbonate with hydrochloric acid when passed through limewater, turns limewater milky.

Reason (R): Carbon dioxide reacts with limewater to form calcium hydrogen carbonate which forms a white precipitate.

[0.8 marks]

A
Both A and R are true, and R is the correct explanation of A.
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B
Both A and R are true, and R is the correct explanation of A.
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C
A is true, but R is false.
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D
A is false, but R is true.
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Solution

The correct option is C A is true, but R is false.
Sodium carbonate reacts with hydrochloric acid to produce sodium chloride, water, and carbon dioxide gas.

Na2CO3(aq) + 2HCl(aq) 2NaCl(aq) + H2O(l) + CO2(g)

This carbon dioxide gas when passed through limewater turns limewater milky.

Carbon dioxide reacts with limewater, i.e., calcium hydroxide to form calcium carbonate and not calcium hydrogen carbonate which forms a white precipitate.

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