Which of the following combination will produce H2 gas?
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)
A
Cu metal and conc.HNO3
B
Fe 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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Solution
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Zn metal and NaOH(aq) will produce hydrogen gas. Zn+2NaOH→Na2ZnO2+H2↑
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