Which of the following combination will produce `H_2` gas?

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Q 2908112008.     Which of the following combination will produce `H_2` gas?
JEE 2017 Advanced Paper 2
A

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

B

Zn metal and NaOH(aq)

C

Fe Metal and conc. `HNO_3`

D

Cu metal and conc. `HNO_3`

HINT


Solution
(Provided By a Student and Checked/Corrected by EXXAMM.com Team)

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