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Q.

A white precipitate was formed when ${BaCl}_{2}$ was added to water extract of an inorganic salt. Further, a gas 'X' with characteristic odour was released when the formed white precipitate was dissolved in dilute HCl. The anion present in the inorganic salt is

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a

${SO}_{3}^{2 -}$

b

${NO}_{2}^{-}$

c

$S^{2 -}$

d

$I^{-}$

answer is B.

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Detailed Solution

${BaCl}_{2} + {SO}_{3}^{2 -} \to \underset{white ppt .}{{BaSO}_{3}} ↓ \overset{dilHCl}{\to} \underset{burning sulphur like smell}{{SO}_{2}} ↑$

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