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Question: A substance on treatment with dilute H<sub>2</sub>SO<sub>4</sub> liberates a colourless gas produces...

A substance on treatment with dilute H2SO4 liberates a colourless gas produces, (i) turbidity with baryta water and, (ii) turns acidified dichromate solution green. These reactions indicate the presence of : -

A

CO3–2

B

S–2

C

SO32–

D

NO2

Answer

SO32–

Explanation

Solution

SO32– + 2H+ ® H2O + SO2

Ba(OH)2 + SO2 ® BaSO3 + H2O

(Insoluble turbidity)

K2Cr2O7 + H2SO4 + SO2 ®

K2SO4 + Cr2(SO4)3 + H2O