Question

The molar ratio of $Fe^{+ +}$ to $Fe^{+ + +}$ in a mixture of $FeSO_{4}$ and $Fe_{2}\left(\right.SO_{4}\left(\left.\right)_{3}$ having equal number of sulphate ion in both ferrous and ferric sulphate is

• A. $1:2$
• B. $3:2$
• C. $2:3$
• D. Can’t be determined

Answer 1

Answer: (B)

Let’s take number of sulphate ion produced from both salt seperatly be X
Then number of $Fe^{2 +}ions=X$
And number $Fe^{3 +}ions=2X/3$
i.e. $Fe^{2 +}:Fe^{3 +}=3:2$