JEE CHEMISTRY MCQ: P-BLOCK ELEMENTS

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Analyzing +4 | -1

A white precipitate was formed when

\mathrm{BaCl}_2

was added to water extract of an inorganic salt. Further, a gas '

\mathrm{X}

' with characteristic odour was released when the formed white precipitate was dissolved in dilute

\mathrm{HCl}

. The anion present in the inorganic salt is

View answer and explanation

Correct option: B

\mathrm{SO}_3^{2-}

Option B (

\mathrm{SO}_3^{2-}

) is correct because BaCl2 precipitates sulfite ions as BaSO3, which releases SO2 gas with a characteristic odor upon reaction with HCl.

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17^{\text {th }}

{O}_2

{O}_2

\mathrm{C}{\mathrm{N}^ - }

{\mathrm{N}_2}

\mathrm{C}{\mathrm{N}^ - },\mathrm{\;}{\mathrm{N}_2}

2 {Fe}^{3+}+{SO}_2+2 {H}_2 {O} \rightarrow 2 {Fe}^{2+}+{SO}_4^{2-}+4 {H}^{+}

{H}_2 {~S}_2 {O}_8

{S}={O}

{S}-{OH}

{O}-

{O}

{NH}_3

{H}_2 {SO}_4

{H}_2 {SO}_4