The fusion of chromite ore with sodium carbonate in the presence of air leads to the formation of products A and B along with the evolution of \(\mathrm{CO}_{2}\). The sum of spin-only magnetic moment values of \(A\) and \(B\) is ____ B.M. (Nearest integer) (Given atomic number : \(\mathrm{C}: 6, \mathrm{Na}: 11, \mathrm{O}: 8\), Fe : 26, Cr : 24]

JEE Main · 2024 · 05 Apr 2024 · Shift 2 · d and f Block Elements

The fusion of chromite ore with sodium carbonate in the presence of air leads to the formation of products A and B along with the evolution of

CO_{2}

. The sum of spin-only magnetic moment values of

A

and

B

is ____ B.M. (Nearest integer)
(Given atomic number :

C : 6, Na : 11, O : 8

, Fe : 26, Cr : 24]

Answer: 6

4 F e C r_{2} O_{4} + 8 N a_{2} C O_{3} + 7 O_{2} \to 8 N a_{2} C r O_{4} + 2 F e_{2} O_{3} + 8 C O_{2}

= N a_{2} C r O_{4}

C r^{6 +}

d^{0}

, so

μ = 0

B.M.
B

= F e_{2} O_{3}

F e^{3 +}

is high-spin

d^{5}

μ = n (n + 2) = 35 \approx 5.9

B.M.
Sum

\approx 0 + 5.9 \approx 6

B.M. (nearest integer).

JEE Main · 2024 · 05 Apr 2024 · Shift 2 · Integer answer