\( K_{\mathrm{sp}} \) of \( \mathrm{CdS}=8 \times 10^{-27}, K_{\mat...

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\( K_{\mathrm{sp}} \) of \( \mathrm{CdS}=8 \times 10^{-27}, K_{\mathrm{sp}} \) of \( \mathrm{ZnS}=1 \times 10^{-21}, K_{\mathrm{a}} \) of \( \mathrm{H}_{2} \mathrm{~S}=1 \times 10^{-21} \)
Which metal sulphide is precipitated first when \( \mathrm{H}_{2} \mathrm{~S} \) is
\( \mathrm{P} \) added?
(A) \( \mathrm{ZnS} \)
(B) Cds
W
(C.) Both at the same time
(D) Both do not form ppt.
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