JEE MAIN - Chemistry (2022 - 27th July Morning Shift - No. 6)
The incorrect statement is
The first ionization enthalpy of K is less than that of Na and Li.
Xe does not have the lowest first ionization enthalpy in its group.
The first ionization enthalpy of element with atomic number 37 is lower than that of the element with atomic number 38.
The first ionization enthalpy of Ga is higher than that of the d-block element with atomic number 30.
Explanation
On moving down in a group ionisation energy decrease
$\therefore 1^{\text {st }}$ ionisation enthalpy order is $\mathrm{Li}>\mathrm{Na}>\mathrm{K}$
$\mathrm{Zn}$ has more ionisation energy as compared to Ga because of their pseudo inert gas configuration.
$\therefore 1^{\text {st }}$ ionisation enthalpy order is $\mathrm{Li}>\mathrm{Na}>\mathrm{K}$
$\mathrm{Zn}$ has more ionisation energy as compared to Ga because of their pseudo inert gas configuration.
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