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JEE Main 202127 AugustEvening Shift
Exam
JEE Main
Year
2021
Date
27 August
Shift
Evening Shift
Subject
Chemistry
Chapter
Classification of Elements and Periodicity in Properties

JEE Main 2021 · 27 August · Evening Shift · Chemistry · Classification of Elements and Periodicity in Properties

The correct order of ionic radii for the ions, P ^ 3 - , S ^ 2 - ,...

The correct order of ionic radii for the ions, P3−,S2−,Ca2+,K+,Cl−{P}^{3 -}, {S}^{2 -}, {Ca}^{2 +}, {K}^{+}, {Cl}^{-} is :

Options

  1. AP3−>S2−>Cl−>K+>Ca2+{P}^{3 -} > {S}^{2 -} > {Cl}^{-} > {K}^{+} > {Ca}^{2 +}
  2. BP3−>S2−>Cl−>Ca2+>K+{P}^{3 -} > {S}^{2 -} > {Cl}^{-} > {Ca}^{2 +} > {K}^{+}
  3. CCl−>S2−>P3−>Ca2+>K+{Cl}^{-} > {S}^{2 -} > {P}^{3 -} > {Ca}^{2 +} > {K}^{+}
  4. DK+>Ca2+>P3−>S2−>Cl−{K}^{+} > {Ca}^{2 +} > {P}^{3 -} > {S}^{2 -} > {Cl}^{-}

Correct answer

A. P3−>S2−>Cl−>K+>Ca2+{P}^{3 -} > {S}^{2 -} > {Cl}^{-} > {K}^{+} > {Ca}^{2 +}

Step-by-step solution

{P3−S2−C−K+Ca2+Z1516171920No.ofe−1818181818\begin{cases}{P}^{3 -} & {S}^{2 -} & C - & {K}^{+} & {Ca}^{2 +} \\ Z & 15 & 16 & 17 & 19 & 20 \\ No . of{e}^{-} & 18 & 18 & 18 & 18 & 18\end{cases}

For isoelectronic species greater is ZZ smaller is radius. So correct order

P3−>S2−>Cl−>K+>Ca2+{P}^{3 -} > {S}^{2 -} > {Cl}^{-} > {K}^{+} > {Ca}^{2 +}

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