Ionization Energies

Q. Four successive members of the first row transition elements are listed below with their atomic numbers. Which one of them is expected to have the highest third ionization enthalpy?

1. Vanadium (Z = 23)
2. Chromium (Z = 24)
3. Manganese (Z = 25)
4. Iron (Z = 26)

Q. While converting $Ce$ to $C{e}^{3+}$, which process requires highest ionization energy?

1. $Ce$ to $C{e}^{+}$
   
2. $C{e}^{+}$ to $C{e}^{3+}$
   
3. Both A and B require the same amount of energy.
4. None of the above

Q. Read the assertion and reason carefully to mark the correct option out of the options given below:

(a)If both assertion and reason are true and the reason is the correct explanation of the assertion.

(b)If both assertion and reason are true but reason is not the correct explanation of the assertion.

(c)If assertion is true but reason is false.

(d)If assertion is false but reason is true.
Assertion: Ionisation enthalpies for early actinoids are lower than that for early lanthanoids.
Reason: 5f electrons more effectively shielded from the nuclear charge than the 4f electrons
of the corresponding lanthanoids.

1. a
2. b
3. c
4. d

Q. Which of the following has $2^{nd}$ Ionisation Potential less than excepted

1. Cr
2. Zn
3. V
4. Mo

Q. The first ionization enthalpies of 5d elements is higher than that of the corresponding 3d and 4d elements. This is best explained by:

1. Greater extent of metallic bonding in 5d elements
2. Neither a nor b
3. Greater effective nuclear charge in the case of 5d elements due to the poor shielding of valence electrons by the 4f electrons
4. Both a and b

Q. The atomic numbers of V, Cr, Mn and Fe are 23, 24, 25 and 26 respectively. Which one of these may be expected to have the highest second ionization enthalpy?

1. Fe
2. V
3. Mn
4. Cr

Q. The atomic number of vanadium (V), chromium (Cr), manganese (Mn) and iron (Fe) are respectively 23, 24, 25 and 26 which one of these may be expected to have the highest second ionization enthalpy

1. Cr
2. Mn
3. Fe
4. V

Q. Which of the following element has maximum first ionisation potential

1. Ti
2. Cr
3. Mn
4. V

Q. Which of the following atoms has the highest first ionization energy?

1. $Na$
2. $K$
3. $Sc$
4. $Rb$

Q.

In halogens, with the increase of atomic number ...

1. Ionic radii decreases

2. Ionization potential decreases

3. Habit to loose electrons decreases

4. In MX₂ (M=metal and X= halogen), covalent properties decreases