ANSWERS: 1
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the reaction Pb + 2 NH4N03 --> Pb(NO3)2 + 2 NH3 (gas) + H2 (gas) is most probably thermodynamically favorable for two reasons 1) the redox potential of lead is slightly lower than that of hydrogen 2) 3 moles of gas are formed which is good as far as entropy is concerned so it would work I don't know about the reaction speed though
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