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Q.

Consider the sulphides HgS,PbS,CuS,NiS,As2S3  and  CdS . Number of these sulphides soluble in50% HNO3    is  

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answer is 4.

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Detailed Solution

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 PbS,CuS,As2S3,CdS are soluble in 50% HNO3 . Where  as HgS and NiS are insoluble in 50%HNO3

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