JEE Advance - Chemistry (2012 - Paper 1 Offline - No. 15)
Which of the following hydrogen halides reacts with AgNO3(aq.) to give a precipitate that dissolves in Na2S2O3 (aq.) ?
HCl
HF
HBr
HI
Explanation
Only HF does not react with AgNO3. All others react with AgNO3 to give precipitate of AgX which is soluble in Na2S2O3
$$HX + AgN{O_3} \to AgX \downarrow + HN{O_3}(X = Cl,Br,I)$$
$$AgX + N{a_2}{S_2}{O_3} \to \mathop {N{a_3}[Ag{{({S_2}{O_3})}_2}]}\limits_{Soluble} \, + NaX$$
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