In which of the reactions represented by the following equations is HNO3 behaving as a typical acid?
A CaO + 2HNO3 → Ca(NO3) 2 + H 2O
B Cu + 4HNO3 → Cu(NO 3)2 + 2H2O + 2NO2
C S + 6HNO3 → H2SO 4 + 6NO2 + 2H2O
D P + 5HNO3 → H 3PO 4 + 5NO2 + H2O
Answer is A
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