Which of the following combination will ...

Which of the following combination will produce `H_(2)` gas ?

A

Zn metal and NaOH (aq)

B

Au metal and NaCN (aq) in the presence of air

C

Cu metal and conc. `HNO_3`

D

Fe metal and conc. `HNO_3`

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The correct Answer is:

A

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