A) heating with sodium sulphate
B) heating with sulphur
C) action of dil sulphuric acid and air
D) dissolving in hot concentrated sulphuric acid
Correct Answer: C
Solution :
Commercially copper sulphate is made from copper scrap by the action of dil. Sulphuric acid and air. \[Cu+{{H}_{2}}{{O}_{4}}+\frac{1}{2}{{O}_{2}}\xrightarrow{{}}CuS{{O}_{4}}+{{H}_{2}}O\] Copper reacts with \[{{H}_{2}}S{{O}_{4}}\] only in presence of oxygen. Copper does not liberate hydrogen from acid because it lies below hydrogen in electrochemical series. Note - \[CuS{{O}_{4}}\,\,.\,\,5{{H}_{2}}O\] is known as blue vitriol.
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