Solutions Question 56

Question: A 0.001 molal solution of $ [Pt{{(NH_3)}4}Cl_4] $ in water had a freezing point depression of $ {{0.0054}^{o}}C $ . If $ K{f} $ for water is 1.80, the correct formulation for the above molecule is [Kerala CET (Med.) 2003]

Options:

A) $ [Pt{{(NH_3)}_4}Cl_3],Cl $

B) $ [Pt{{(NH_3)}_4}Cl],Cl_2 $

C) $ [Pt{{(NH_3)}_4}Cl_2],Cl_3 $

D) $ [Pt{{(NH_3)}_4}Cl_4] $

Show Answer

Answer:

Correct Answer: B

Solution:

$ \Delta T_{f}=imk_{f} $ ; $ 0.0054=i\times 1.8\times 0.001 $

$ i=3 $ so it is $ [Pt{{(NH_3)}_4}Cl]Cl_2 $ .



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