A) dissolving it in hot cone. \[{{H}_{2}}S{{O}_{4}}\]
B) spraying warm dilute \[{{H}_{2}}S{{O}_{4}}\] on it in the presence of air
C) heating with sodium sulphate
D) heating with sulphur.
Correct Answer: A
Solution :
\[CuS{{O}_{3}}\] is commercially made from \[Cu\] scrap by the reaction of dilute \[{{H}_{2}}S{{O}_{4}}\] in the presence of air,. \[Cu+{{H}_{2}}S{{O}_{4}}+\underset{air}{\mathop{\frac{1}{2}{{O}_{2}}}}\,\xrightarrow{{}}CuS{{O}_{4}}+{{H}_{2}}O\]
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