Ionization Energy and Electron Affinity

Q. The amount of energy released when a million atoms of iodine are completely converted into $I^{–}$ ions in the vapour state according to the equation, $I\left(g\right)+e^{–}\to I^{–}\left(g\right)$ is $5.0\times {10}^{–13}$ J.
Calculate the electron gain enthalpy of iodine in terms of $kJmo{l}^{–1}$.

1. $-301kJ/mol$
2. $-602kJ/mol$
3. $-30.1kJ/mol$
4. $-150.5kJ/mol$

Q.

Among group 15 elements, the one having a negative electron affinity is:

1. Nitrogen

2. Phosphorus

3. Antimony

4. Bismuth

Q. Ionization potential and electron affinity of fluorine are $17.42$ and $3.45eV$ respectively. The electronegativity of fluorine on Mulliken scale and Pauling scale is $x$ & $y$ respectively, then $\frac{(x+y)}{1.011}$is:

1. 12
2. 13
3. 14
4. 15

Q. The electron gain enthalpy (in kJ/mol) of Fluorine, Chlorine, Bromine and Iodine, respectively, are:

1. $-333,-325,-349\text{and}-296$
2. $-333,-349,-325\text{and}-296$
3. $-296,-325,-333\text{and}-349$
4. $-349,-333,-325\text{and}-296$

Q. There are four elements p, q , r and s having atomic number $Z-1,Z,Z+1,Z+2$ respectively. If the element q is an inert gas, select the correct statements from following statements:
(i) p has most negative electron gain enthalpy in the respective period
(ii) r is an alkali metal
(iii) s exists in +2 oxidation states

1. (i) and (ii) only
2. (ii) and (iii) only
3. (i) and (iii) only
4. (i), (ii) and (iii)

Q. There are four elements p, q , r and s having atomic number $Z-1,Z,Z+1,Z+2$ respectively. If the element q is an inert gas, select the correct statements from following statements:
(i) p has most negative electron gain enthalpy in the respective period
(ii) r is an alkali metal
(iii) s exists in +2 oxidation states

1. (i) and (ii) only
2. (ii) and (iii) only
3. (i) and (iii) only
4. (i), (ii) and (iii)

Q. Which of the following pairs show opposite trend on moving along a period from left to right ?

1. Atomic radius and electron gain enthalpy (negative value)
2. Nuclear charge and ionization enthalpy
3. Ionization enthalpy and electron gain enthalpy (negative value)
4. None of the above

Q. Which of the following pairs show opposite trend on moving along a period from left to right ?

1. Atomic radius and electron gain enthalpy (negative value)
2. Nuclear charge and ionization enthalpy
3. Ionization enthalpy and electron gain enthalpy (negative value)
4. None of the above

Q. The first and the second ionisation energies of magnesium are 7.646 eV and 15.035 eV respectively. The amount of energy in kJ needed to convert all the atoms of magnesium into $M{g}^{2+}$ ions present in 24 mg of magnesium vapour will be:
(Given $1eV=96.5kJmo{l}^{–1}$).

1. $2.455kJ$
2. $2.188kJ$
3. $1.094kJ$
4. $4.370kJ$

Q. Which of the following species has lowest ionisation enthalpy?

1. $O$
2. $O^{+}$
3. $O^{-}$
4. $O^{2-}$