Name the gas formed when

Question

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

Answer 1

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.

Answer 2

H2sS gas with foul smell