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प्रश्न
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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उत्तर
- 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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संबंधित प्रश्न
Complete the following reaction, balance it and write the name of the products CuO + HCI →_________ + _________
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This is an example of:
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Solutions of copper sulphate, iron sulphate and zinc sulphate are prepared and marked I, II and III respectively. Few pieces of aluminium are added to each solutions. After some time a change will be observe in
(A) I and II
(B) II and III
(C) III and I
(D) All the three
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- exchange of ions takes place
- a precipitate is produced
- an insoluble salt is produced
The correct option is:
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(i) displacement reaction
(ii) combination reaction
(iii) redox reaction
(iv) neutralisation reaction
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(i) Displacement reaction
(ii) Precipitation reaction
(iii) Combination reaction
(iv) Double displacement reaction
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Identify the product which represents the solid state in the above reaction.
Give an example of a double displacement reaction.
