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(D) In $CO_2$,the total number of electrons is $6 + 8 + 8 = 22$.In the cyanamide ion $(CN_2^{2-})$,the total number of electrons is $6 + 7 + 7 + 2 = 2

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All of the above.

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(D) In $CO_2$,the total number of electrons is $6 + 8 + 8 = 22$.In the cyanamide ion $(CN_2^{2-})$,the total number of electrons is $6 + 7 + 7 + 2 = 22$. Since both have $22$ electrons,they are isoelectronic. Both $CO_2$ and $(CN_2^{2-})$ exhibit a linear structure. Thus,statement $(a)$ is correct.$Mg_2C_3$ reacts with water to produce propyne: $Mg_2C_3 + 4H_2O 	o 2Mg(OH)_2 + CH_3C \equiv CH$. Thus,statement $(b)$ is correct.The crystal structure of $CaC_2$ is of the $NaCl$ type (distorted rock salt structure). Thus,statement $(c)$ is correct.Therefore,all the given statements are correct.

Select the correct statement$(s)$.

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