Question

During the developing process in photography, unexposed $AgBr$ is washed away by complexation of $Ag\left(I\right)$ by sodium thiosulphate solution. These washings are often disposed of as waste. However, metallic silver can be recovered from them by adding cyanide, followed by zinc. What is the hybridization of zinc is the complex formed during the recovery of silver?

• A. $s{p}^3{d}^2$
• B. $d^{2}s{p}^3$
• C. $s{p}^3$
• D. $ds{p}^2$

Answer 1

The correct option is C $s{p}^3$

The chemical reaction during recovery of complex

$Zn+2\left[Ag\right(CN{)}_2{]}^{-}\to \left[Zn\right(CN{)}_4{)}^{2-}+2Ag$

ppt

Now we have to find the hybridisation of $\left[Zn\right(CN{)}_4{]}^{2-}]$

Oxidation number of $Zn$ in the above complex is

$x-4=-2$

$x=+2$

then find out for hybridisation.(image)