A mixture contains, ${C O}_{3}^{2 -}$ , ${S O}_{3}^{2 -}$ and ${S O}_{4}^{2 -}$ .
If scheme given to identify above unknowns is true enter 1, if false enter 0.
Add dil. $H C l$ , brisk reaction with pungent odour gas indicates ${S O}_{3}^{2 -}$ (and also ${C O}_{3}^{2 -}$ , pungent gas is ${S O}_{2}$ ). Add $K_{2} {C r}_{2} O_{7}$ solution. If mixture turns green then ${S O}_{3}^{2 -}$ is confirmed. Pass the evolved gas into lime water, if it turns milky, ${C O}_{3}^{2 -}$ is confirmed.

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Solution

Add dil. $H C l$ , brisk reaction with pungent odour gas or odourless indicates the presence of either ${S O}_{3}^{2 -}$ or ${C O}_{3}^{2 -}$
pungent gas is ${S O}_{2}$ ). Odourlss gas is $C O_{2}$ .
Add $K_{2} {C r}_{2} O_{7}$ solution.
If mixture turns green then ${S O}_{3}^{2 -}$ is confirmed.
Sulphite ion reduces potassium dichromate to green coloured chromium sulphate $(C r_{2} (S O_{4})_{3})$
Pass the evolved gas into lime water, if it turns milky, ${C O}_{3}^{2 -}$ is confirmed.
The lime water turns milky due to formation of insoluble calcium carbonate.
$C O_{2} + C a (O H)_{2} \to C a C O_{3} ↓ + H_{2} O$

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