InterviewSolution
`ZnCO_3 rarr ZnO +CO_2``Fe_2O_3 +3CO rarr 2Fe+3CO`-2`2PbS+3O_2 rarr 2PbO +2O_2``Al_2 O_3 .2H_2O rarr Al_2O_3 + 2H_2O`
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