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  4. A colourless organic compound gives brisk effervescences with a mixture of sodium nitrite and dil. HCl. It could be

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Q. A colourless organic compound gives brisk effervescences with a mixture of sodium nitrite and dil. HCl. It could be

NTA AbhyasNTA Abhyas 2022

Solution:

$NaNO_{2}+HCl \rightarrow HNO_{2}+NaCl$
$\underset{\text{Urea}}{\text{H}_{2} \text{NCONH}_{2}} + \text{HNO}_{2} \rightarrow \text{CO}_{2} + \text{NH}_{3} + \text{H}_{2} \text{O} + \text{N}_{2}$
$CO_{2}$ gas evolves with brisk effervescence.