How is magnesium obtained from the following?
- ABy reduction of $MgO$ with coke
- BBy reduction of magnesium salt solution with $Fe$
- CBy electrolysis of molten magnesium salt
- DBy electrolysis of $Mg(NO_3)_2$ solution
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When sodium is heated in excess of air,which of the following compounds are obtained?
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| $I. Na_3N$ | $II. Na_2O$ |
| $III. NaO_2$ | $IV. Na_2O_2$ |
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