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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

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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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