During the presence of SO_3^ 2- and S^ 2- in a mixture, on addition of dil. H_2SO_4, one notices that:

JEE Main Chemistry question

During the presence of and in a mixture, on addition of dil. , one notices that:

(A) and are not formed
(B) and formed during the change undergo a redox reaction forming colloidal sulphur, and thus no smell is noticedCorrect
(C)A smell of burning sulphur
(D)A smell of rotten egg

Answer: (B)

Acidification liberates (from ) and (from ) together, which then comproportionate ($+ →

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Question ID VK-137064