Question

When iron sulfide (FeS) is combined with hydrogen chloride (HCl), a gas is formed in a double-displacement reaction. Which gas would it be? A. FeS, B. FeH, C. H2S, D. H2Fe

Answer 1

The answer is C. H2s

Answer 2

Answer : The correct option is, (C)
`H_2S` gas

Explanation :

Double replacement reaction : It is a type of chemical reaction in which a positive cation and a negative anion of two reactants exchange their places to form two new products.

It is represented as,

`XY+AB\rightarrow XB+AY`

(X and A are the cations, Y and B are the anions)

When the iron sulfide (FeS) combined with hydrogen chloride (HCl) to give iron(II)chloride and hydrogen sulfide gas as a product.

The balanced chemical reaction will be,

`FeS(s)+HCl(l)\rightarrow FeCl_2(s)+H_2S(g)`

Hence, the gas would be, (C)
`H_2S` gas