Question

Compound D is insoluble in water but soluble in $KCN$ give_________.

• A. $\left[Hg\right(CN{)}_2{]}^{-}$
• B. $\left[Hg\right(CN{)}_4{]}^{2-}$
• C. $\left[Ag\right(CN{)}_2{]}^{-}$
• D. $AgCN$

Answer 1

The correct option is C $\left[Ag\right(CN{)}_2{]}^{-}$

White precipitate changes to yellow, brown and finally becomes black

$S_2{O}_3^{2-}+2A{g}^{+}\to \underset{white}{A{g}_2{S}_2{O}_3};A{g}_2{S}_2{O}_3+H_{2}O\to \underset{black}{A{g}_{2}S}+H_{2}S{O}_4$

$2AgN{O}_3\stackrel{{450}^{o}C}{\to }2Ag+2N{O}_2+O_2$

$A{g}^{+}+2C{N}^{-}\to \left[Ag\right(CN{)}_2{]}^{-}+I^{-}$