an alloy of M is used for soldering when a nitrate of M is heated it gives a yellowish brown colour metal oxide together with a brown gas G1 one and a colourless gas G2 to identify G1
and G2 and write the balanced chemical equation
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2Pb(NO3)2 -> 2PbO + 4NO2 + O2
M is lead which which is alloyed with tin for soldering
G1 is nitrous dioxide
G2 is oxygen
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