Classification Of Elements And Periodicity In Properties Question 241
Question: In which of the following arrangements the order is NOT according to the property indicated against it [AIEEE 2005]
Options:
A) $ A{{l}^{3+}}<M{{g}^{2+}}<N{{a}^{+}}<{{F}^{-}} $ : Increasing ionic size
B) $ B<C<O<N $ : Increasing first ionization enthalpy
C) $ I<Br<F<Cl $ : Increasing electron gain enthalpy (with negative sign)
D) $ Li<Na<K<Rb $ : Increasing atomic radius
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Answer:
Correct Answer: B
Solution:
$ B<C<N<O $ ; When we move from B to O in a periodic table, the first ionisation enthalpy increases due to the attraction of the nucleus towards the outermost electron.
BETA
