The molar ratio of and ions in a mixture of and if each component of mixture provides…

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Problem

The molar ratio of

Fe^{2+}

and

Fe^{3+}

ions in a mixture of

FeSO_4

and

Fe_2(SO_4)_3

if each component of mixture provides equal no. of sulphate ions : (1) 2 : 3 (2) 3 : 2 (3) 1 : 2 (4) 1 : 4