MCQ
In laboratory silicon can be prepared by the reaction
- ABy heating carbon in electric furnace
- BBy heating potassium with potassium dichromate
- ✓Silica with magnesium
- DNone of these
Reaction: $SiO _2+2 Mg \rightarrow Si +2 MgO$
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$FeCr _{2} O _{4}+ Na _{2} CO _{3}+ O _{2} \rightarrow A + Fe _{2} O _{3}+ CO _{2}$
$A + H ^{+} \rightarrow B + H _{2} O + Na ^{+}$