Consider the sulphides $\mathrm{HgS}, \mathrm{PbS}, \mathrm{CuS}, \mathrm{Sb} 2 \mathrm{~S}_3, \mathrm{As}_2 \mathrm{~S}_3$ and CdS . Number of these sulphides soluble in $50 \% \mathrm{HNO}_3$ is $\_\_\_\_$ .
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Solution
Pbs, $\mathrm{CuS}, \mathrm{As}_2 \mathrm{~S}_3, \mathrm{CdS}$ are soluble in $50 \% \mathrm{HNO}_3 \mathrm{HgS}, \mathrm{Sb}_2 \mathrm{~S}_3$ are insoluble in $50 \% \mathrm{HNO}_3$
So Answer is 4 .
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