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B
FeS2+HCl→FeCl2+2H2S
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C
2FeS2+4HCl→2FeCl2+2H2S
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D
FeS+2HCl→FeCl2+2H2S
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Solution
The correct option is AFeS+2HCl→FeCl2+H2S The balanced equation for the preparation of H2S from dil HCl is shown below. FeS+2HCl→FeCl2+H2S This is laboratory method. We can also use H2SO4 instead of HCl.