A 0.001 molal solution of Pt(NH_3)_4Cl_4 in water had a freezing point depression of 0.0054°C. If K_f for water is

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Q 2186612577.     A 0.001 molal solution of Pt(NH_3)_4Cl_4 in water had a freezing point depression of 0.0054°C. If K_f for water is 1.80, the correct formula for the above compound assuming its complete dissociation is
A

[Pt(NH_3)_4Cl_3]Cl

B

[Pt(NH_3)_4Cl_2]Cl_2

C

[Pt(NH_3)_4Cl]C_3l

D

[Pt(NH_3)_4Cl_4]

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