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Consider the sulphides \mathrm{HgS}$, $\mathrm{PbS}$, $\mathrm{CuS}_{}, \mathrm{Sb}_{2} \mathrm{~S}_{3},\mathrm{As}_{2} \mathrm{~S}_{3} and \mathrm{CdS}. Number of these sulphides soluble in 50 \% \mathrm{HNO}_{3} is_________.
 

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The sulphide which are soluble in \mathrm{50% \ HNO_{3}} are \mathrm{PbS,\ CuS,\ As_{2}S_{3},\ CdS}

Sulphides insoluble in \mathrm{50%\ HNO_{3}} are \mathrm{HgS} and \mathrm{Sb_{2}S_{3}}

Hence, the correct answer is 4

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