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  4. The ratio of the value of any colligative property for K 4[ Fe ( CN )6] to that of Fe 4[ Fe ( CN )6]3 solution is nearly

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Q. The ratio of the value of any colligative property for $K _{4}\left[ Fe ( CN )_{6}\right]$ to that of $Fe _{4}\left[ Fe ( CN )_{6}\right]_{3}$ solution is nearly

NTA AbhyasNTA Abhyas 2020Solutions

Solution:

van't Hoff factor of $K _{4}\left[ Fe ( CN )_{6}\right]=5$

$K _{4}\left[ Fe ( CN )_{6}\right]=4 K ^{+}+\left[ Fe ( CN )_{6}\right]^{4-}$

van't Hoff factor of $Fe _{4}\left[ Fe ( CN )_{6}\right]_{3}=7$

$Fe _{4}\left[ Fe ( CN )_{6}\right]_{3}=4 Fe ^{3+}+3\left[ Fe ( CN )_{6}\right]^{4-}$

So ratio of colligative properties $=\frac{5}{7}=0.71$.