IIT-JEE Exam

The packing efficiency of the two-dimensional square unit cell shown below
is
(A) 39.27% (B) 68.02%
(C) 74.05% (D) 78.54%.

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IIT-JEE Other Question

Assuming that Hund’s rule is violated, the bond order and magnetic nature of the diatomic molecule B2 is
(A) 1 and diamagnetic (B) 0 and diamagnetic
(C) 1 and paramagnetic (D) 0 and paramagnetic. The complex showing a spin-only magnetic moment of 2.82 B.M. is