For 1 molal aqueous solution of the following compounds, which one will show the highest freezing point?

Question

[Co(H₂O)₃ Cl₃].3H₂O

[Co(H₂O)₆] Cl₃

[Co(H₂O)₅ Cl] Cl₂.H₂O

[Co(H₂O)₄ Cl₂] Cl.2H₂O

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