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NEET Chemistry QUESTION #1069
Question 1
Which one of the following reactions does NOT belong to Lassaigne's test?
  • \(\text{Na} + \text{X} \xrightarrow{\Delta} \text{NaX}\)
  • \(2\text{CuO} + \text{C} \xrightarrow{\Delta} 2\text{Cu} + \text{CO}_2\)✔️
  • \(\text{Na} + \text{C} + \text{N} \xrightarrow{\Delta} \text{NaCN}\)
  • \(2\text{Na} + \text{S} \xrightarrow{\Delta} \text{Na}_2\text{S}\)
Correct Answer Explanation
Lassaigne's test involves fusing the organic compound with sodium metal to convert covalent elements (N, S, halogens) into ionic sodium salts (NaCN, Na\(_2\)S, NaX). The reaction \(2\text{CuO} + \text{C} \to 2\text{Cu} + \text{CO}_2\) is the copper oxide test used to detect carbon/hydrogen, and does NOT belong to Lassaigne's test.