Question

The incorrect statement is

• A. The first ionization enthalpy of K is less than that of Na and Li.
• B. Xe does not have the lowest first ionization enthalpy in its group.
• C. The first ionization enthalpy of element with atomic number 37 is lower than that of the element with atomic number 38.
• D. The first ionization enthalpy of Ga is higher than that of the d-block element with atomic number 30.

Answer 1

Answer: (D)

The first ionization enthalpy of Ga is higher than that of the d-block element with atomic number 30.

Answer 2

On moving down in a group ionisation energy decrease

∴ First ionisation enthalpy order is $Li > Na > K$
$Zn$ has more ionisation energy as compared to Ga because of their pseudo-inert gas configuration.

The correct answer is (D): The first ionization enthalpy of $Ga$ is higher than that of the d-block element with atomic number $30$.