Q. 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

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$1:2$

$3:2$

$2:3$

Can’t be determined

Solution:

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. $Fe^{2 +}:Fe^{3 +}=3:2$

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