Write the equation for the laboratory preparation of the following salt using sulphuric acid: Copper sulphate From Copper

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Solution

When copper metal (Cu) reacts with hot and concentrated sulphuric acid (H₂SO₄), it forms cyan blue colored copper sulphate (CuSO₄) which is a soluble salt, water (H₂O), and sulphur dioxide (SO₂).
As Cu is less reactive than hydrogen in an electrochemical series, thus Cu cannot displace H of dilute sulphuric acid.
But concentrated sulphuric acid is a strong oxidizing agent, thus it oxidizes Cu.
Hence, it is a redox reaction.
The chemical equation :
$Cu (s) + 2 H_{2} {SO}_{4} (aq) \to {CuSO}_{4} (aq) + {SO}_{2} (g) + 2 H_{2} O (l)$

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Q. Write equations for the laboratory preparation of the following salts, using sulphuric acid:
(i) iron (II) sulphate from the iron.
(ii) copper sulphate from copper.
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(iv) iron (II) sulphide
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