(D) Calcium carbide is represented as $CaC_2$,which consists of $Ca^{2+}$ and $[C \equiv C]^{2-}$ ions. In the acetylide ion $[C \equiv C]^{2-}$,there

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(D) Calcium carbide is represented as $CaC_2$,which consists of $Ca^{2+}$ and $[C \equiv C]^{2-}$ ions. In the acetylide ion $[C \equiv C]^{2-}$,there is a triple bond between the two carbon atoms. $A$ triple bond consists of $1$ sigma $(\sigma)$ bond and $2$ pi $(\pi)$ bonds.