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JEE Main levelSingle correct optionDifficulty 2 of 3df125

Match the aqueous ions in List I with the number of unpaired electrons in List II (high-spin configurations). List I: (P) $Cu X^{2 +}$ , (Q) $Ni X^{2 +}$ , (R) $Co X^{2 +}$ , (S) $Mn X^{2 +}$ . List II: (1) 1, (2) 2, (3) 3, (4) 5.

AP-1, Q-2, R-3, S-4
BP-1, Q-3, R-2, S-4
CP-1, Q-2, R-4, S-3
DP-2, Q-1, R-3, S-4

Answer: A

Cu X^{2 +}

is

d^{9}

(1),

Ni X^{2 +}

is

d^{8}

(2),

Co X^{2 +}

is

d^{7}

with

t_{2 g}^{5} e_{g}^{2}

(3),

Mn X^{2 +}

is

d^{5}

(5). So P-1, Q-2, R-3, S-4.

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