Which of the following combination will produce H2 gas?

+3 votes

asked Mar 29, 2019 in Chemistry by kratos

Which of the following combination will produce H2 gas?
(A) Fe Metal and conc. HNO3
(B) Cu metal and conc. HNO3
(C) Zn metal and NaOH(aq)
(D) Au metal and NaCN(aq) in the presence of air

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+6 votes

answered May 22, 2020 by kratos

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The correct answer is:

Which of the following combination will produce H2 gas?

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