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Question

Which of the following halides react(s) with AgNO3(aq) to give a precipitate that dissolves in Na2S2O3(aq)
(IIT-JEE, 2012)

A
HCl
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B
HF
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C
HBr
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D
HI
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Solution

The correct option is D HI
AgNO3+HClAgCl
AgNO3+HBrAgBr
AgNO3+HlAgI
All these precipitates will get dissolved in hypo (Na2S2O3) forming complex, Na3[Ag(S2O3)2]

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