Question

when gas formed reacting metal sulphides with dil. H2SO4 is passed into Cl2 water gives

Answer 1

What do you think about the nature of the intermediate gas formed?

Answer 2

I am really poor in chemistry... Is SO2 released as intermediate gas?

Answer 3

No it's not.
The first reaction is an acid base reaction.

Let's say the metal is zinc.
So ZnS is made up of zinc ions \(Zn^{2+}\) and sulfide ions \(S^{2-}\).

\(S^{2-}\) is a (double) base that will react with sulfuric acid.

That should help you find the gas (smelling of rotten eggs and toxic).

Answer 4

H2S ?

Answer 5

Yep!

Now, the second reaction is a redox reaction.
Chlorine is an oxidising agent and hydrogen sulfide a reducing agent.

Answer 6

so, finally is HCl formed? what happens to S? Does it oxidize to free S2 or something like that?

Answer 7

I think it will oxidate to solid sulfur.

\(H_2S \rightarrow S+2H^++2e^- \)

Answer 8

what is the final answer? is it HCl? But HCl is not in the list of options..

Answer 9

It should be colloidal sulphur.. i guess.. It is in the list of options..

Answer 10

Correct: colloidal sulfur is a very divided form of solid sulfur.

Answer 11

thanks! and HCl is formed as byproduct.. right?

Answer 12

Yes.