A red-brown metal X forms a salt XSO 4- When hydrogen sulphide gas is passed through an aqueous solution of XSO 4- then a black precipitate of XS is formed alongwith sulphuric acid solution-a What could the salt XSO 4 be-b What is the colour of salt XSO 4 -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-

(a) The salt XSO4 is CuSO4. (b) The colour of the salt CuSO4 is blue. (c) The black precipitate XS is copper sulphide (CuS). (d) CuSO4 + H2S rarr; CuS + H ...

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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?

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Solution

(a) The salt XSO₄ is CuSO₄.

(b) The colour of the salt CuSO₄ is blue.

(c) The black precipitate XS is copper sulphide (CuS).

(d) CuSO₄ + H₂S → CuS + H₂SO₄

(e) Double displacement reaction takes place in this case.

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Two metals X and Y form the salts $X S O_{4}$ and $Y_{2} S O_{4}$ , respectively. The solution of salt $X S O_{4}$ is blue in colour whereas that of $Y_{2} S O_{4}$ is colourless. When barium chloride solution is added to $X S O_{4}$ solution, then a white precipitate Z is formed along with a salt which turns the solution green. And when barium chloride solution is added to $Y_{2} S O_{4}$ solution, then the same white precipitate Z is formed along with colourless common salt solution.

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(a) The salt XSO4 is CuSO4. (b) The colour of the salt CuSO4 is blue. (c) The black precipitate XS is copper sulphide (CuS). (d) CuSO4 + H2S → CuS + H2SO4 (e) Double displacement reaction takes place in this case.

(a) The salt XSO₄ is CuSO₄.

(b) The colour of the salt CuSO₄ is blue.

(c) The black precipitate XS is copper sulphide (CuS).

(d) CuSO₄ + H₂S → CuS + H₂SO₄

(e) Double displacement reaction takes place in this case.