THE FORMULA OF CALCIUM CARBIDE Cac2 BUT ACCORDING TO VALENCIESTHE FORMULA SHOULD BE Ca2c WHY....?????
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A pretty genuine doubt, even I had this doubt when I first saw this formula. The answer lies in the fact that carbon can form bond with other carbon atoms, I guess you can guess the answer now
In calcium carbide the carbide ion is an acetylide ion (C2)- in which two carbon atoms are joined by a triple bond and therefore two( one on each carbon) valencies are left vacant and these two valencies combine with the divalent Calcium to form CaC2.
(NOTE: The bond is primarily ionic so you can consider it to be the -2 charge on acetylide balanced by +2 on Calcium
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