Question

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 alongwith 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 ?

Lakhmir Singh Chemistry Class 10

Answer 1

a:The salt XSO4 be sulphuric acid solution

Answer 2

Hey dear,

● Answers -
Here, metal X is Cu (Copper).


a) Salt XSO4 => CuSO4 (Copper sulphate)

b) Colour of salt => blue

c) Black ppt XS => CuS (Copper sulphide)

d) When hydrogen sulphide is passed through copper sulphate soln, black ppt of copper sulphide is formed.
CuSO4 + H2S ---> CuS + H2SO4

e) Type of reaction => double displacement reaction

Hope this help you...