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  4. Which of the following salt has the same value of vant’s Hoff factor as that of K 3[ Fe ( CN )6] ?

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Q. Which of the following salt has the same value of vant’s Hoff factor as that of $K _{3}\left[ Fe ( CN )_{6}\right]$ ?

AIIMSAIIMS 1998Solutions

Solution:

$K _{3}\left[( FeCN )_{6}\right]$ on ionisation gives 4 species $\left(3 K ^{+}\right.$ and $\left.1\left[ Fe ( CN )_{6}\right]^{3-}\right)$ and $Al \left( NO _{3}\right)_{3}$ also gives 4 species $\left(1 Al ^{3+}\right.$ and $\left.3 NO _{3}^{-}\right)$, thus both will have same value of Van't Hoff factor.