A first row transition metal with highest enthalpy of atomisation, upon reaction with oxygen at high temperature forms oxides of formula ${\mathrm{M}}_{2}{\mathrm{O}}_{\mathrm{n}}$ (where n =3,4, 5). The 'spin-only' magnetic moment value of the amphoteric oxide from the above oxides is ________ BM (nearest integer)

(Given atomic number: $(\mathrm{Sc}:21,\mathrm{Ti}:22,\mathrm{V}:23,\mathrm{Cr}:24,\mathrm{Mn}:25,\mathrm{Fe}:26,\mathrm{Co}:27,\mathrm{Ni}:28,\mathrm{Cu}:29,\mathrm{Zn}:30)$) EndFragment

[JEE Main 2024, 04 Apr (Shift 2)]

Question

A first row transition metal with highest enthalpy of atomisation, upon reaction with oxygen at high temperature forms oxides of formula ${\mathrm{M}}_{2}{\mathrm{O}}_{\mathrm{n}}$ (where n =3,4, 5). The 'spin-only' magnetic moment value of the amphoteric oxide from the above oxides is ________ BM (nearest integer)

(Given atomic number: $(\mathrm{Sc}:21,\mathrm{Ti}:22,\mathrm{V}:23,\mathrm{Cr}:24,\mathrm{Mn}:25,\mathrm{Fe}:26,\mathrm{Co}:27,\mathrm{Ni}:28,\mathrm{Cu}:29,\mathrm{Zn}:30)$) EndFragment

[JEE Main 2024, 04 Apr (Shift 2)]

YESPYQ · Accepted Answer

Correct answer: a) 0. 'V' has highest enthalpy of atomisation (515 kJ/mol) among first row transition elements. V 2 O 5 Here 'V' is in +5 oxidation state V +5 $\Rightarrow$1s 2 2s 2 2p 6 3s 2 3p 6 (no unpaired electrons)

A first row transition metal with highest enthalpy of atomisation, upon reaction with oxygen at high temperature forms o…

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