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Question

Which of the following combination will produce H2 gas?
  1. Au metal and NaCN(aq) in the presence of air
  2. Cu metal and conc.HNO3
  3. Fe metal and conc.HNO3
  4. 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
Solution
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Zn metal and NaOH(aq) will produce hydrogen gas.
Zn+2NaOHNa2ZnO2+H2

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