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Q.

In which of the following options, the order of arrangement does not agree with the variation of property indicated against it?

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a

Li < Na < K < Rb (increasing metallic radius)

b

Al3+

c

B < C < N < O (increasing first ionization enthalpy)

d

I < Br < Cl < F (increasing electron gain enthalpy)

answer is C.

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Detailed Solution

Incorrect option are (3) & (4)Correct order of increasing 1st I.E. → B < C < O < Ncorrect order of increasing electron gainEnthalpy → I < Br < F < Cl (in magnitude)Values (in kJ/mol) → 296,325,333,249
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In which of the following options, the order of arrangement does not agree with the variation of property indicated against it?