Dilute hydrochloric acid is added to solid sodium carbonate. It is observed that :

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No change takes place

A brisk effervescence occurs

A loud sound is produced

The solution turns blue

answer is C.

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Detailed Solution

Dilute hydrochloric acid is added to solid sodium carbonate. It is observed that a brisk effervescence occurs.
A neutralization reaction that takes place when diluted

HCl

, an acid is introduced to sodium carbonate, a basic salt, resulting in the creation of

NaCl

and the rapid effervescence of carbon dioxide gas. Its reaction is given as

N a_{2} C O_{3} + 2 HCl \to 2 NaCl + H_{2} O + C O_{2}

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