Which of the following combination will ...

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

A

Fe metal and conc. `HNO_(3)`

B

Cu metal and conc. `HNO_(3)`

C

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

D

Zn metal and `NaOH(aq)`

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The correct Answer is:

D

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