Which of the following has a high polarising | vedclass

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(B) According to Fajan's rule,the polarising power of a cation is directly proportional to its charge density. Greater the charge on the cation and sm

Vedclass · Accepted Answer

$Al^{3+}$

Vedclass · Answer

(B) According to Fajan's rule,the polarising power of a cation is directly proportional to its charge density. Greater the charge on the cation and smaller its size,the higher will be its polarising power. Comparing the given ions: $Na^{+}$ ($+1$ charge,larger size) $Mg^{2+}$ ($+2$ charge,smaller than $Na^{+}$) $Ca^{2+}$ ($+2$ charge,larger than $Mg^{2+}$) $Al^{3+}$ ($+3$ charge,smallest size among the given options). Therefore,$Al^{3+}$ has the highest charge-to-size ratio,resulting in the highest polarising power.

Which of the following has a high polarising power?

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