JEE CHEMISTRY MCQ: P-BLOCK ELEMENTS

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Application +4 | -1

In qualitative analysis, when

\mathrm{H}_2 \mathrm{~S}

is passed through an aqueous solution of salt acidified with dil.

\mathrm{HCl}

, a black precipitate is obtained. On boiling the precipitate with dil.

\mathrm{HNO}_3

, it forms a solution of blue colour. Addition of excess of aqueous solution of ammonia to this solution gives ......... .

View answer and explanation

Correct option: B

deep blue solution of

\left[\mathrm{Cu}\left(\mathrm{NH}_3\right)_4\right]^{2+}

Option B (deep blue solution of

\left[\mathrm{Cu}(\mathrm{NH}_3)_4\right]^{2+}

) is correct because copper ions react with excess ammonia to form a tetraammine complex, which has a deep blue color.

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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

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{S}-{OH}

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