A sample of water was checked for suitability for drinking and was subjected to a chemical test. Pure zinc granules and sulphuric acid were added to the water sample. The effervescence that resulted from the reaction was bubbled through a tube containing lead acetate solution. A black precipitate appeared. The outgoing gas was subsequently passed through a heated copper tube, a black mirror appeared on the wall of the tube. The first and second black substances, respectively, are : [KVPY 2007] (A) Hgs and cus (B) PbS and Cus (C) As and Hg (D) PbS and As
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Answer:
b) PbS and CuS
Explanation:
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Answer:
B.
Explanation:
The first and second black substances are PbS and Cus.
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