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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.
- What could the salt XSO4 be?
- What is the colour of salt XSO4?
- Name the black precipitate XS.
- 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.
- What type of chemical reaction takes place in this case?
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Solution
- The salt XSO4 is copper(II) sulphate (CuSO4).
- The colour of the salt CuSO4 is blue.
- The black precipitate XS is copper sulphide (CuS).
- \[\ce{CuSO4_{(aq)} + H2S_{(g)} -> CuS_{(s)}\downarrow + H2SO4_{(aq)}}\]
- A double displacement reaction or precipitation reaction takes place in this case.
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