Select the correct statement(s). (AIIMS 2008) (a) Cyanamide ion \( ...

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Select the correct statement(s).
(AIIMS 2008)
(a) Cyanamide ion \( \left(\mathrm{CN}_{2}^{2-}\right) \) is isoelectronic with \( \mathrm{CO}_{2} \) and has the same linear structure
\( \mathrm{P} \)
(b) \( \mathrm{Mg}_{2} \mathrm{C}_{3} \) reacts with water to form propyne
W
(c) \( \mathrm{CaC}_{2} \) has \( \mathrm{NaCl} \) type lattice
(d) All of these
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