Test Index

JEE Mains 27 July 2022 Shift 1 Paper

Section: Chemistry

Question : 66 of 90

Marks: +1, -0

The first ionization enthalpy of $\mathrm{K}$ is less than that of $\mathrm{Na}$ and $\mathrm{Li}$ .
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 .

Solution:

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

\mathrm{Ga}

because of their pseudo inert gas configuration.

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