d and f block elements

Section: Chemistry

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Question : 12 of 24

Marks: +1, -0

Which of the following combination will produce H2 gas ?

[JEE Adv 2017 P2]

Au metal and NaCN(aq) in the presence of air
Cu metal and conc.HNO3
Fe metal and conc. HNO3
Zn metal and NaOH(aq)

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