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 \(\mathrm{n}=3,4,5)\). The 'spin-only' magnetic moment value of the amphoteric oxide from the above oxides is ____ BM (near integer) (Given atomic number : Sc : 21, Ti : 22, V : 23, Cr : 24, Mn : 25, Fe : 26, Co : 27, Ni : 28, Cu: 29, Zn : 30)

JEE Main · 2024 · 04 Apr 2024 · Shift 2 · d and f Block Elements

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

M_{2} O_{n}

(where

n = 3, 4, 5)

. The 'spin-only' magnetic moment value of the amphoteric oxide from the above oxides is ____ BM (near integer)
(Given atomic number : Sc : 21, Ti : 22, V : 23, Cr : 24, Mn : 25, Fe : 26, Co : 27, Ni : 28, Cu: 29, Zn : 30)

Answer: 0

Solution

The 3d metal with the highest enthalpy of atomisation is vanadium (V,

\approx 515 kJ mo l^{- 1}

). On high-temperature oxidation it gives

V_{2} O_{3}, V_{2} O_{4}, V_{2} O_{5}

(

n = 3, 4, 5

). Among these the amphoteric oxide is

V_{2} O_{5}

, in which vanadium is in the

+ 5

state (

3 d^{0}

). With no unpaired electrons the spin-only moment

μ = n (n + 2) = 0

BM.

JEE Main · 2024 · 04 Apr 2024 · Shift 2 · Integer answer

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JEE Main · 2024 · 04 Apr 2024 · Shift 2 · d and f Block Elements

Solution

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