Which of the following is correct regarding ionic radii ?

T i^{4 +} < M n^{+ 7}

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^{35} C l - <^{37} C l^{-}

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K^{+} > C l^{-}

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P^{3 +} > P^{5 +}

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Solution

The correct option is C $P^{3 +} > P^{5 +}$
No. of electrons in $P^{3 +}$ = 12
No. of electrons in $P^{5 +}$ = 10
Effective nuclear charge = { $\frac{N u c l e a r c h a r g e}{n o . o f e l e c t r o n s}$ } is less for $P^{3 +}$ and therefore size of $P^{3 +}$ > $P^{5 +}$

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