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Q.

How many of the following salts gives brisk effervescence  of colorless gas(X) with dilute acid which turns lead acetate paper black

CaCO3,CaSO3,KNO2,NaHCO3,CaS,MgSO3,PbCl2,NaNO3

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Detailed Solution

CaS  

CaS + H2SO4 →CaSO4 + H2S

H2S gives black precipitate with lead acetate

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