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Question

Chemistry Question on Chemical bonding and molecular structure

Which has minimum solubility?

A

Bi2S3Bi _{2} S _{3}

B

Ag2SAg _{2} S

C

CoSCoS

D

PbSPbS

Answer

Ag2SAg _{2} S

Explanation

Solution

Solubilities of salts are as follows:
Bi2S3=Ksp1085Bi_{2} S_{3}=\sqrt[5]{\frac{K_{s p}}{108}}
=1.6×10−721085=\sqrt[5]{\frac{1.6 \times 10^{-72}}{108}}
=1.7×10−15=1.7 \times 10^{-15}
Ag2S=Ksop43A g_{2} S=\sqrt[3]{\frac{K_{\text{sop}}}{4}}
=1.6×10−4943=\sqrt[3]{\frac{1.6 \times 10^{-49}}{4}}
=3.4×10−17=3.4 \times 10^{-17}
PbS=Ksp=1.1×10−29P b S=\sqrt{K_{s p}}=\sqrt{1.1 \times 10^{-29}}
=3.3×10−15=3.3 \times 10^{-15}
CoS=ksp=2×10−27C o S=\sqrt{k_{s p}}=\sqrt{2 \times 10^{-27}}
=4.5×10−14=4.5 \times 10^{-14}
Hence, Ag2SA g_{2} S is least soluble.
So minimum solubility is of CoSC o S as its force of attraction is greatest