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Q.

Which of the following option is incorrect with respect to ionic radii ?

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a

${Ti}^{4 +} < {Mn}^{2 +}$

b

$^{35} {Cl}^{-} <^{37} {Cl}^{-}$

c

$K^{+} > {Cl}^{-}$

d

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

answer is C.

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Detailed Solution

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The radius decreases as the period progresses to the right and increases as we go down on the Periodic table.
Cations are always smaller than their parent atoms.
This is because they have lesser electrons, while their nuclear charge remains the same.
The remaining electrons are, therefore held more tightly by the protons in the nucleus and thus their radii are smaller than the parent atoms.
This is opposite in case of anions.
Hence by the factors mentioned above ionic radii of Cl⁻> K⁺

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Which of the following option is incorrect with respect to ionic radii ?