For 1molal solution of each compound minimum freezing point will be assuming complete ionisation in each case:

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FeH2O6Cl3

FeH2O5ClCl2⋅H2O

FeH2O4Cl2Cl⋅2H2O

FeH2O3Cl3⋅3H2O

answer is A.

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Detailed Solution

Tf∝moles of non-volatile solute, maximum ions minimum Tf.

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