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Match List-I (Solid salt treated with dil. $H_2SO_4$) with List-II (Anion detected) and choose the correct answer from the options given below:
Column I
- A. Effervescence of colourless gas
- B. Gas with smell of rotten egg
- C. Gas with pungent smell
- D. Brown fumes
Column II
- I. NO2-
- II. CO3^2-
- III. S2-
- IV. SO3^2-
Correct answer: A → II, B → III, C → IV, D → I
Detailed Solution
Effervescence of colourless gas indicates $CO_3^{2-}$ (A-II); gas with smell of rotten egg indicates $S^{2-}$ (B-III); gas with pungent smell indicates $SO_3^{2-}$ (C-IV); brown fumes indicate $NO_2^-$ / $NO_3^-$ (D-I).