Balance the following equations: [2]
(i) Pb + NaOH Na2PbO2 + H2
(ii) HNO3 + H2S NO2 + H2
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(i) Pb + 2NaOH ----- Na2PbO2 + H2
(ii) 2HNO3 + H2S ---- 3NO2 + 2H2
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