Among the given options which one is not correct?

A l^{3 +} < M g^{2 +} < N a^{+} < F^{-}

(Increasing ionic size)

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B < C < N < O

(Incresing first ionization enthalpy)

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I < B r < F < C l

(Increasing electron gain enthalpy)

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L i < N a < K < R b

(Increasing metallic radius)

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Solution

The correct option is C $B < C < N < O$ (Incresing first ionization enthalpy)
For isoelectronic species $,$ always radii is inversely proporsonal to number of protons $.$
$∴$ radii $\propto \frac{e^{-}}{p} \propto \frac{1}{p}$

and $r = F^{-} > {N a}^{+} > {M g}^{2 +} > {A l}^{3 +}$

and $I E = N > O > C > B,$ since $N$ has $p^{3}$ configuration which is half filled and more stable $.$

Metallic character increases down the group.

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Similar questions

In which of te following options order of arrangement does not agree with the variation of property indicated against it?
(a) $A l^{3 +} < M g^{2 +} < N a^{+} < F -$ (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)

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

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

b) B<C<N<O(increasing 1st ionisation enthalpy)

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

d) Al³⁺<Mg²⁺<Na⁺<F^-(increasing ionic size)

Q. In which of the following arrangements, the order is according to the property indicated against it.

(I) I < B r < F < C l increasing electron gain enthalpy

(I I) L i < N a < K < R b increasing metallic radius

(I I I) B < C < N < O increasing first ionization energy

(I V) A l^{3 +} < M g^{2 +} < N a^{+} < F^{-} increasing ionic size

Arrange the following as per instructions given in the brackets.

(a) Mg. Cl, Na, S, Si (decreasing order of atomic size)

(b) Cs, Na, Li, K, Rb (increasing metallic character)

(d) Cl, F, Br, I (increasing electron affinity)

(e) Cs, Na, Li, K, Rb (decreasing electronegativity)

Q. Arrange the following isoelectronic species in order of increasing ionization enthalpy (IE).

O^{2 -}, F^{-}, {N a}^{+}, {M g}^{2 +}

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