Which of the following reagent gives an effervescence on treatment with a carboxylic acid?

N a H C O_{3}

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N a H S O_{3}

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N a

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N a O H

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Solution

The correct options are
A $N a H C O_{3}$
C $N a$
A. All metal carbonate reacts with an acid to give corresponding salt and water by liberating carbon dioxide gas.

B. $S O_{2}$ and $S O_{3}$ are acidic oxide.

C. The metal reacts with an acid to form salt by liberating hydrogen gas.

D. NaOH is a base it reacts with an acid to form salt and water.

Hence, option A & C result in effervescence.

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