Question

Match the precipitates of the compounds listed in List-1 with the solvent(s) listed in List-2.

Answer 1

$\left(a\right)\begin{array}{ccccc}Zn(OH{)}_2\downarrow & +& 4KCN& ⟶& K_2\left[Zn\right(CN{)}_4]+2KOH\\ & & & & colorlesssolublecomplex\end{array}$
$\begin{array}{ccccc}Zn(OH{)}_2\downarrow & +& 4N{H}_3& ⟶& \left[Zn\right(NH3\left)4\right]\left(OH\right)2\\ & & & & colorlesssolublecomplex\end{array}$
$\begin{array}{ccc}Zn(OH{)}_2\downarrow 2NaOH& ⟶& N{a}_2\left[Zn\right(OH{)}_4]\\ & & colorlesssolublecomplex\end{array}$
$\left(b\right)$ It is slightly soluble in cold
$\begin{array}{ccccc}Cr(OH{)}_3\downarrow & +& 6N{H}_3& ⟶& \left[Cr\right(N{H}_3{)}_6{]}^{3+}+3O{H}^{-}\\ & & & & \left(pinkorvioletsolublecomplex\right)\end{array}$
$\begin{array}{ccccc}Cr(OH{)}_3\downarrow & +& O{H}^{-}& ⟶& \left[Cr\right(OH{)}_4{]}^{-}\\ & & & & Greensolublecomplex\end{array}$
$\begin{array}{cccccccc}2Cr(OH{)}_3\downarrow & +3N{A}_2{O}_2& ⟶& 2N{a}_{2}Cr{O}_4& +& 2NaOH& +& 2H_{2}O\\ & & & Yellowsolution& & & & \end{array}$
$\left(c\right)AgCl\downarrow +2N{H}_3⟶\left[Ag\right(N{H}_3{)}_2]Cl$
$AgCl+2C{N}^{-}⟶\left[Ag\right(CN{)}_2{]}^{-}+C{l}^{-}$
$r,s⟶No$
$\left(d\right)2CuS\downarrow +8C{N}^{-}2⟶2\left[Cu\right(CN{)}_4{]}^{3-}+S_2^{2-}colorlesssolublecomplex\left(Redoxreaction\right)$.
$CuS+N{a}_2{O}_2\stackrel{H_{2}O}{\to }CuS{O}_4+NaOH$
$CuS\downarrow +H_{2}O⟶CuS{O}_{4}solublecompound$