In a test tube containing vinegar, small amount of baking soda is mixed. A gas bubbles out along with hissing sound. The gas is:

Hydrogen gas

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Oxygen gas

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Carbon dioxide

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Nitrogen gas

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Solution

The correct option is C Carbon dioxide
Vinegar is mixture of acetic acid, $C H_{3} C O O H$ . Baking soda is $N a H C O_{3}$ .
When they are mixed, carbon dioxide gas evolved.
$C H_{3} C O O H + N a H C O_{3} \to C H_{3} C O O N a + H_{2} O + C O_{2}$

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