p-Block elementsHard

Question

Select correct statement (s).

Options

A.Cyanamide ion (CN22-) is isoelectronic with CO2 and has the same linear structure
B.Mg2C2 reacts with water to form propyne
C.CaC2 has NaCl type lattice
D.All of the above

Solution

In CO2 we have 22 (6 + 8 + 8 = 22)electrons.In (CN22-) we have 22(6 + 7 + 7 + 2 = 22) electrons. Both CO2 and (CN22-) have linear structures. Thus statement (a) is correct.
Mg2C3 + 4H2O → 2Mg(OH)2 + CH3 C ≡ CH
                                                                Propyne
i.e., statement (b) is also correct.
The structure of CaC2 is NaCl type
i.e., statement (c) is also correct.

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