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Chief ore of `Zn` is `ZnS`. The ore is concentrated by froth flotation process and then heated in air to convert `ZnS` to `ZnO`. ltntgt `2 ZnS + 3O_(2) rarr 2 ZnO + 2 SO_(2)`…(i) `ZnO`, thus formed is treated with dilute `H_(2) SO_(4)`. `ZnO + H_(2) SO_(4) rarr ZnSO_(4) + H_(2) O` ....(ii) On electrolysis of `ZnSO_(4(aq)), Zn` metal is produced. `2 ZnSO_(4) + H_(2) O rarr 2 Zn + 2H_(2) SO_(4) + O_(2)`....(iii) `ZnO` on dissolution in `NaOH` givesA. `Na_(2) ZnO_(2)`B. `NaZnO_(2)`C. `NaZn(OH)_(4)`D. `NaZn_(2) O_(3)` |
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Answer» Correct Answer - A `ZnO + 2NaOH rarr Na_(2) ZnO_(2) + H_(2) O`. |
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