Question

Which one of the following reactions does not belong to “Lassaigne's test”?

Options

• \[\ce{Na + C + N ->[][\Delta] NaCN}\]

• \[\ce{2Na + S ->[][\Delta] Na2S}\]

• \[\ce{Na + X ->[][\Delta] NaX}\]

• \[\ce{2CuO + C ->[][\Delta] 2Cu + CO2}\]

Answer 1

\[\ce{2CuO + C ->[][\Delta] 2Cu + CO2}\]

Explanation:

Lassaigne’s test can identify halogens, nitrogen, phosphorus, and sulphur. The Lassaigne test does not detect carbon.