JEE Main 2022 · 30 Jul · Shift 2 · Chemistry Q58

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ChemistryInteger+4 / -1Question 58 of 90

The number of coloured and paramagnetic ions from the following in aqueous solution are _______.

Ti $^{3+}$ , Co $^{2+}$ , Ni $^{2+}$ , Cu $^{2+}$ , Cu $^+$ , Ti $^{4+}$ , Zn $^{2+}$ , Sc $^{3+}$

Given Atomic no. Sc, 21; Ti, 22; Co, 27; Ni, 28; Cu, 29; Zn, 30

Your answer

Answer and worked solution

Official answer: 4

Unpaired d electrons: Ti³⁺ ( $d^1$ ), Co²⁺ ( $d^7$ ), Ni²⁺ ( $d^8$ ), Cu²⁺ ( $d^9$ ) are coloured and paramagnetic. Cu⁺ and Zn²⁺ ( $d^{10}$ ), Ti⁴⁺ and Sc³⁺ ( $d^0$ ) are neither. Four.

Answer: 4

Topics:Transition element properties

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JEE Main 2022 · 30 Jul · Shift 2, Chemistry question 58