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Q.

Consider the following statements.
I) ${Li}_{2}$ in vapour state is paramagnetic.
II) $C_{2}$ in vapour state is diamagnetic.
III) ${Be}_{2}$ does not exist.
IV) Triple bond in $N_{2}$ consists of only pi bonds.
Among these statements

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a

II and IV are incorrect

b

All are incorrect

c

I and III are correct

d

I and IV are incorrect

answer is C.

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Detailed Solution

${Li}_{2}$ in vapour state is diamagnetic;

${Li}_{2} - KK {(σ_{2 s})}^{2}; B . O = \frac{4 - 2}{2} = 1$

Triple bond in $N_{2}$ consists of one sigma and two pi bonds;

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Consider the following statements.I) Li2 in vapour state is paramagnetic.II) C2 in vapour state is diamagnetic.III) Be2 does not exist.IV) Triple bond in N2 consists of only pi bonds.Among these statements