Which of the following combination will produce H_2 gas?

JEE Advanced 2017 Chemistry question

Which of the following combination will produce gas?

(A)Fe metal and conc.
(B)Cu metal and conc.
(C)Zn metal and NaOH(aq)Correct
(D)Au metal and NaCN(aq) in the presence of air

Answer: (C)

Solution

(C) Zinc is amphoteric and dissolves in aqueous alkali with evolution of hydrogen: . (A) Iron is rendered passive by concentrated nitric acid. (B) Copper reduces concentrated

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Question ID VK-026667