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Question

In which of te following options order of arrangement does not agree with the variation of property indicated against it?
(a)Al3+<Mg2+<Na+<F (Increasing ionic size)
(b) B < C < N < O (Increasing first ionlsation enthalpy)
(c) I < Br < Cl< F (increasing electron gain enthalpy)
(d) Li < Na< K < Rb (Increasing metallic radius)
 


Solution

Answers: (b) B < C < N < O (Increasing first ionisation enthalpy)
                (c) I < Br < Cl< F (increasing electron gain enthalpy)

For increasing first ionization enthalpy, the order should be: B < C < O < N

For increasing electron gain enthalpy, the order should be: I < Br < F < Cl


Chemistry
NCERT Exemplar
Standard XI

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