JEE Main · 2024 · 06 Apr 2024 · Shift 2 · d and f Block Elements

Among

VO_{2}^{+}, MnO_{4}^{-}

and

Cr_{2} O_{7}^{2 -}

, the spin-only magnetic moment value of the species with least oxidising ability is ______ BM (Nearest integer).
(Given atomic number

V = 23, Mn = 25, Cr = 24

)

Answer: 0

Solution

VO_{2}^{+}

has V in

+ 5

(

d^{0}

MnO_{4}^{-}

has Mn in

+ 7

(

d^{0}

), and

Cr_{2} O_{7}^{2 -}

has Cr in

+ 6

(

d^{0}

) — all three are

d^{0}

ions, so regardless of which is judged the weakest oxidiser, that species has zero unpaired electrons and a spin-only magnetic moment of

0

BM.

JEE Main · 2024 · 06 Apr 2024 · Shift 2 · Integer answer