A) Dissolving in hot conc. \[{{H}_{2}}S{{O}_{4}}\]
B) The action of dil. \[{{H}_{2}}S{{O}_{4}}\] and air
C) Heating with sodium sulphate
D) Heating with sulphur
Correct Answer: B
Solution :
\[2Cu+2{{H}_{2}}S{{O}_{4}}+{{O}_{2}}\to 2CuS{{O}_{4}}+2{{H}_{2}}O\]
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