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Q.

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


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a

No change takes place

b

A brisk effervescence occurs

c

A loud sound is produced

d

The solution turns blue 

answer is C.

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Detailed Solution

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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
Na2CO3+2HCl  2NaCl+H2O+CO2
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