A red-brown metal X forms a salt XSO4. When hydrogen sulphide gas is passed through an aqueous solution of XSO4, then a black precipitate of XS is formed along with sulphuric acid solution.
(a) What could the salt XSO4 be?
(b) What is the colour of salt XSO4?
(c) Name the black precipitate XS
(d) By using the formula of the salt obtained in (a) above, write an equation of the reaction which takes place when hydrogen sulphide gas is passed through its aqueous solution.
(e) What type of chemical reaction takes place in this case?

3 years ago

(a) Copper sulphate is be the salt formed named as XSO₄.

(b) The salt is blue in colour as it is copper sulphate

(d) Chemical equation for the reaction involved:

CuSO₄ (aq) + H₂S (g) → CuS (s) + H₂SO₄(aq)

(e) A double displacement reaction occurs when two compounds react and the positive and negative ions from the two reactants replace each other, resulting in the formation of new molecules.