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A colourless organic compound gives brisk effervescence with a mixture of sodium nitrite and dil. `HCl`. It could be
A. Oxalic acid
B. acetic acid
C. urea
D. glucose

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Correct Answer - C
`NaNO_(2) + HCl rarr HNO_(2) + NaCl`
`underset("Urea")(H_(2)NCONH_(2)) + HNO_(2) rarr CO_(2) + NH_(3) + H_(2)O + N_(2)`
`CO_(2)` gas evolves with brisk effervescence

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