JEE Advance - Chemistry (2016 - Paper 2 Offline - No. 11)
In the following reaction, sequence in aqueous solution, the species X, Y and Z, respectively, are
$${S_2}O_3^{2 - }\buildrel {A{g^ + }} \over \longrightarrow \mathop X\limits_{Clear\,solution} \buildrel {A{g^ + }} \over \longrightarrow \mathop Y\limits_{White\,precipitate} \buildrel {With\,time} \over \longrightarrow \mathop Z\limits_{Black\,precipitate} $$
[Ag(S2O3)2]3$$-$$, Ag2S2O3, Ag2S
[Ag(S2O3)2]5$$-$$, Ag2SO3, Ag2S
[Ag(SO3)2]3$$-$$, Ag2S2O3, Ag
[Ag(SO3)3]3$$-$$, Ag2SO4, Ag
Explanation
$$A{g^ + }\mathop {2{S_2}O_3^{2 - }}\limits_{(Excess)} \to \mathop {{{[Ag{{({S_2}{O_3})}_2}]}^{3 - }}}\limits_{Argentothiosulphate\,(X)\,(Soluble)} \buildrel {A{g^ + }} \over
\longrightarrow \mathop {A{g_2}{S_2}{O_3}}\limits_{(Y)\,(White\,ppt.)} \mathrel{\mathop{\kern0pt\longrightarrow}
\limits_{(due\,to\,hydrolysis)}^{With\,time}} \mathop {A{g_2}S}\limits_{(Z)\,(Black\,ppt.)} $$
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