Among H_2 , He_2^+ , Li_2 , Be_2 , B_2 , C_2 , N_2 , O_2^- , and F_2 , the number of diamagnetic species is (Atomic numbers: H = 1, He = 2, Li = 3, Be = 4, B = 5, C = 6, N = 7, O = 8, F = 9)

JEE Advanced 2017 Chemistry question

Among , , , , , , , , and , the number of diamagnetic species is (Atomic numbers: H = 1, He = 2, Li = 3, Be = 4, B = 5, C = 6, N = 7, O = 8, F = 9)

Answer: 6

Solution

Official scoring status: BONUS / +3 TO ALL (printing inconsistency in the question). Intended/calculated answer: 6, worked out as follows. Using MO configurations: () diamagnetic; (3 electrons, one unpaired) paramagnetic; () diamagnetic;

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Question ID VK-026620