7. HOTS - Copper oxide reaction

Pick out the correct option.
 
Answer variants:
\(H_2SO_4\)
\(NH_4OH\)
\(CuSO_4\)
Neutralization
 
\(CuO\) + (X) → \(CuSO_4\) + \(H_2O\). Here (X) is ______.
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