JEE Main & Advanced Chemistry Solutions / विलयन Question Bank Critical Thinking Solutions

  • question_answer
    A 0.001 molal solution of \[[Pt{{(N{{H}_{3}})}_{4}}C{{l}_{4}}]\] 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]

    A)                 \[[Pt{{(N{{H}_{3}})}_{4}}C{{l}_{3}}]\,Cl\] 

    B)             \[[Pt{{(N{{H}_{3}})}_{4}}Cl]\,C{{l}_{2}}\]

    C)                 \[[Pt{{(N{{H}_{3}})}_{4}}C{{l}_{2}}]\,C{{l}_{3}}\] 

    D)                 \[[Pt{{(N{{H}_{3}})}_{4}}C{{l}_{4}}]\]

    Correct Answer: B

    Solution :

               \[\Delta {{T}_{f}}=im{{k}_{f}}\]; \[0.0054=i\times 1.8\times 0.001\]                                     \[i=3\] so it is \[[Pt{{(N{{H}_{3}})}_{4}}Cl]C{{l}_{2}}\].


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