Question

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 1

Correct answer is : 6

\(4FeCr_2O_4 + 8Na_2CO_3 + 7O_2 \rightarrow \underset{A}{8Na_2 CrO_4} + \underset {B}{2Fe_2O_3} + 8CO_2\)

Spin only magnetic moment

For \(Na_2 CrO_4\)	\(\mu _ B = 0\)
For \(Fe_2O_3\)	\(\mu _ B = 5.9\)

sum = 5.9