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+HCl→AgCl↓ AgNO3+HBr→AgBr↓ AgNO3+Hl→AgI↓
All these precipitates will get dissolved in hypo (Na2S2O3) forming complex, Na3[Ag(S2O3)2]