Multiple Choice

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

A$$Al^{3+} < Mg^{2+} < Na^{+} < F^{-}$$ (increasing ionic size)
B$$B < C < N < O$$ (increasing first ionisation enthalpy)
Correct Answer
C$$I < Br < Cl < F$$ (increasing electron gain enthalpy)
Correct Answer
D$$Li < Na < K< Rb$$ (increasing metallic radius)

Solution

The electron gain enthalpy of chlorine is more than fluorine because in it the added electron goes to the smaller energy level (n=2) and hence suffers significant repulsion from the electrons already present in this shell.
First ionisation enthalpy of Nitrogen is more than oxygen due to half filled p orbital which makes the nitrogen more stable.

SIMILAR QUESTIONS

Periodic Classification of Elements

The third ionization enthalpy is minimum for :

Periodic Classification of Elements

The first ionization energy (in kJ/mol) of Na, Mg, Al and Si respectively, are:

Periodic Classification of Elements

Which of the following represents the correct order of increasing first ionization enthalpy for $$Ca$$, $$Ba$$, $$S$$, $$Se$$ and $$Ar$$?

Periodic Classification of Elements

Compare the alkali metals and alkaline earth metals with respect to (i) ionisation enthalpy (ii) basicity of oxides and (iii) solubility of hydroxides.

Periodic Classification of Elements

In the periodic table, the maximum chemical reactivity is at the extreme left (alkali metals) and extreme right (halogens). Which properties of these two groups are responsible for this?

Periodic Classification of Elements

The element having very high ionization enthalpy but zero electron gain enthalpy is :

Periodic Classification of Elements

The first ionisation potential of $$Na, Mg, Al$$ and $$Si$$ are in the order:

Periodic Classification of Elements

In which of the following transformation least energy is required?

Periodic Classification of Elements

Which of the following electronic configuration is associated with the biggest jump between the second and third ionization energies?

Periodic Classification of Elements

For which of the following reaction $$\Delta H^\circ$$ value is equal to the first ionization energy of Ca is?

Contact Details