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

Gujarat BoardEnglish MediumSTD 11 ScienceChemistry3. Classification of elements and periodicity in properties1 Mark
MCQ
Which of the following order is correct for the property mentioned in brackets ?
  • A
    $S^{2-} > Cl^{-} > K^+ > Ca^{2+}$  (Ionisation energy)
  • ✓
    $C < N < F < O$ ($2^{nd}$ Ionisation energy)
  • C
    $B > Al > Ga > In > Tl$ (Electronegativity)
  • D
    $Na^+ > Li^+ > Mg^{2+} > Be^{2+} > Al^{3+}$ (Ionic radius)
✓

Answer

Correct option: B.
$C < N < F < O$ ($2^{nd}$ Ionisation energy)
b
$(b)$ $(a) $ Correct order $\to Ca^{2+} > K^+ > Cl^- > S^{2-}$ (Ionisation energy)
For isoeleetronic species $(I.E. \propto Z_{eff})$
$(b)$ Correct order $\to C < N < F < O$ ($2^{nd} \,I.E.)$
Second electron removal from oxygen requires more energy as it acquires  table $2s^2\,2p^3$
configuration after removal of one electron.
$(c)$ Correct order $\to B > Tl > In > Ga > Al$ (Electronegativity)
In general $EN$ increases in boron family from top to bottom due to increase in $Z_{eff}$ on
valence shell while boron has highest $E.N.$ due to its vary small size.
$(d)$ Correct order $\to Na^+ > Li^+ > Mg^{2+} > Al^{3+} > Be^{2+}$ (Ionic  radius) 
Ionic radius depends on $Z_{eff}$ and number of shells.

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