JEE Main 2026 · 5 Apr · Shift 2 · Chemistry Q71

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ChemistryInteger+4 / -1Question 71 of 75

The total number of unpaired electrons present in the $d^3$ , $d^4$ (low spin) $d^5$ (high spin), $d^6$ (high spin) and $d^7$ (low spin) octahedral complex systems is ________.

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Answer and worked solution

Official answer: 15

Unpaired electrons in octahedral fields:

Configuration	Arrangement	Unpaired
$d^3$	$t_{2g}^3$	3
$d^4$ low spin	$t_{2g}^4$	2
$d^5$ high spin	$t_{2g}^3e_g^2$	5
$d^6$ high spin	$t_{2g}^4e_g^2$	4
$d^7$ low spin	$t_{2g}^6e_g^1$	1

Total: 15.

Answer: 15

Topics:Crystal field theory Magnetic properties and colour

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JEE Main 2026 · 5 Apr · Shift 2, Chemistry question 71