In salt analysis among the following, total number of acidic radicals gives colourless volatile gas/vapour as a observation with dilute $H_{2} SO_{4}$ is.

Question

In salt analysis among the following, total number of acidic radicals gives colourless volatile gas/vapour as a observation with dilute H 2 ​ SO 4 ​ is.

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Question Explanation:

Question is asking to choose anions which give colorless gases with $H_{2} SO_{4}$ .

Concept: This question is based on Dilute Acid Group Anions.

Solution:

The acidic radicals that give colorless volatile gas/vapor with dilute $H_{2} S O_{4}$ are:

$C H_{3} COO^{-}$ $C O_{3}^{2 -}$ , $S O_{3}^{2 -}$ , $S_{2} O_{3}^{2 -}$ , $S^{2 -}$ . The products are $C H_{3} COOH$ (vapor), $C O_{2}$ , $S O_{2}$ , $H_{2} S$ and $S O_{2} (S_{2} O_{3}^{2 -})$ also yields elemental sulfur. $N O_{2}^{-}$ gives a colored product ( $N O_{2}$ gas) .

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