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Concentrated HNO3 reacts with NaCN and Na2S to eliminate their interference. Which of the following reactions correctly represents this process?

1. NaCN reacts with HNO3 to produce NaNO3 and release HCN gas.
2. Na2S reacts with 2 moles of HNO3 to form 2 moles of NaNO3 and release H2S gas.
3. The stability of a carbanion increases with a higher percentage of 's' character.
4. Electron-donating groups reduce the stability of a carbanion.

Correct answer: NaCN reacts with HNO3 to produce NaNO3 and release HCN gas.

Solution

Option A is correct because concentrated HNO3 reacts with NaCN to produce NaNO3 and HCN gas, which aligns with the decomposition reaction described.

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