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Name the gas formed when

a)dilute HCL is added to a mixture of iron filings and sulphur
b)dilute HCL is added to a compound of iron and sulphur

2 answers

1. Hydrogen gas. It comes from the reaction between iron and HCl.
2. Hydrogen sulfide gas comes from the compound of FeS when HCl is added.

H2sS gas with foul smell

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