The ion precipitating first when a solution containing 0.01 M each of Pb2+,Zn2+,Mn2+ and Co2+ is saturated with H2S  is (which provides 1.0×10−14M of S2−n the solution) is   (Given: Ksp(PbS)=2.3×10−27M2,Ksp(ZnS)=1.0×10−21M2,Ksp(MnS)=7.9×10−13M2)

# The ion precipitating first when a solution containing  each of ${\mathrm{Pb}}^{2+},{\mathrm{Zn}}^{2+},{\mathrm{Mn}}^{2+}$ and ${\mathrm{Co}}^{2+}$ is saturated with ${\mathrm{H}}_{2}\mathrm{S}$  is (which provides $1.0×{10}^{-14}\mathrm{M}$ of ${\mathrm{S}}^{2-}$n the solution) is   (Given: ${K}_{\mathrm{sp}}\left(\mathrm{PbS}\right)=2.3×{10}^{-27}{\mathrm{M}}^{2},{K}_{\mathrm{sp}}\left(\mathrm{ZnS}\right)=1.0×{10}^{-21}{\mathrm{M}}^{2},{K}_{\mathrm{sp}}\left(\mathrm{MnS}\right)=7.9×{10}^{-13}{\mathrm{M}}^{2}$)

1. A

${\mathrm{Pb}}^{2+}$

2. B

${\mathrm{Zn}}^{2+}$

3. C

${\mathrm{Mn}}^{2+}$

4. D

${\mathrm{Co}}^{2+}$

Register to Get Free Mock Test and Study Material

+91

Live ClassesRecorded ClassesTest SeriesSelf Learning

Verify OTP Code (required)

### Solution:

Lesser the value of ${K}_{\mathrm{sp}}$, earlier the salt precipitates. Hence, ${\mathrm{Pb}}^{2+}$ is precipitated first.

When cations and anions in an aqueous solution interact, a precipitate, an insoluble ionic solid, is created. The common ionic solids' solubility principles can be used to determine whether or not such a reaction takes place.