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In which of the following arrangements, the order is not according to the property indicated against it?

Option: 1

Li<K<Na<Rb Increasing metallic radius 


Option: 2

I<Br<F<Cl Electron gain enthalpy (Without negative sign)


Option: 3

B<Cl<O<N   Increasing first Ionisation enthalpy


Option: 4

\mathrm{Al^{3+}<Mg^{2+}<Na^+<F^-}  Increasing ionic size


Answers (1)

best_answer

As we move down the group Zeff increases & the electron gain enthalpy also increases with the negative sign.

With the negative sign, the order should be 

Cl<F<Br<I 

But without negative sign order will be

I<Br<F<Cl Electron gain enthalpy. 

Posted by

Divya Prakash Singh

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