JEE Main 2022 · 27 Jul · Shift 1 · Chemistry Q66

ChemistrySingle correct+4 / -1Question 66 of 90

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.

Answer and worked solution

Official answer: D

Check.

(A) K < Na < Li: true.
(B) Rn, not Xe, has the lowest value in group 18: true.
(C) Rb (37) < Sr (38): true.
(D) Ga (579 kJ mol $^{-1}$ ) is lower than Zn (906 kJ mol $^{-1}$ ), so D is incorrect.

(D)

Topics:Ionisation enthalpy

JEE Main 2022 · 27 Jul · Shift 1, Chemistry question 66