Question

A first row transition metal with highest enthalpy of atomisation, upon reaction with oxygen at high temperature forms oxides of formula \(M_2O_n\) (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 1

Correct answer is : 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)