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JEE Main levelSingle correct optionDifficulty 2 of 3as201

Counting the exchanges possible among electrons of parallel spin (in the ground state, each distinct pair of same-spin electrons counts as one exchange), the number of exchanges in the $3 d^{6}$ configuration of $Fe X^{2 +}$ is

A15
B10
C6
D11

Answer: B

In

3 d^{6}

, five electrons have spin up (one per orbital) and one has spin down. Exchanges = pairs among parallel-spin electrons

= (2 5) + (2 1) = 10 + 0 = 10

.

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