Dilute acetic acid was added to the four test tubes containing the following chemicals.
Brisk effervescence was observed in the test tubes) containing :

NaOH

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NaCl

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N a H C O_{3}

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N a_{2} C O_{3}

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Solution

The correct options are
C $N a H C O_{3}$
D $N a_{2} C O_{3}$
Dilute acetic acid was added to the four test tubes containing the following chemicals. Brisk effervescence was observed in the test tubes containing $N a H C O_{3}, N a_{2} C O_{3}$ . This is because an acid reacts with metal carbonate and metal bicarbonate to evolve carbon-dioxide gas with brisk effervescence.

$C H_{3} C O O H (a q) + N a H C O_{3} (a q) \to C H_{3} C O O N a (a q) H_{2} O + C O_{2} (g)$
$2 C H_{3} C O O H (a q) + N a_{2} C O_{3} \to 2 C H_{3} C O O N a (a q) + C O_{2} (g) + H_{2} O$ .
Hence options C and D are correct.

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Dilute acetic acid was added to the four test tubes containing the following chemicals.Brisk effervescence was observed in the test tubes) containing :

Dilute acetic acid was added to the four test tubes containing the following chemicals.
Brisk effervescence was observed in the test tubes) containing :