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3. Classification of elements and periodicity in properties — Chemistry STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 ScienceChemistry3. Classification of elements and periodicity in properties1 Mark
MCQ
Incorrect order of radius is
  • A
    $Sr^{2+} < Rb^+ < Br^- < Se^{2-}$
  • B
    $Nb^{5+} < Zr^{4+} < Y^{3+}$
  • C
    $Co >Co^{2+} > Co^{3+} > Co^{4+}$
  • ✓
    $B{a^{2 + }} < C{s^ + } < S{e^{2 - }} < A{s^{3 - }}$
✓

Answer

Correct option: D.
$B{a^{2 + }} < C{s^ + } < S{e^{2 - }} < A{s^{3 - }}$
d
$(d)$   In $(a)$ and $(b)$ use $(z / e)$ concept for isoelectronic specie.
In $(c)$ size of neutral atom is greater than its cation.
In $(d)\, Se^{2-}$ and $As^{3-}$ related with $4^{th}$ period, while $Ba^{2+}$ and $Cs^+$ related with $6^{th}$ period. (These are not isoelectronic species.)

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