1
JEE Main 2022 (Online) 29th July Morning Shift
+4
-1

The first ionization enthalpy of Na, Mg and Si, respectively, are : 496, 737 and $$786 \mathrm{~kJ} \mathrm{~mol}^{-1}$$. The first ionization enthalpy ($$\mathrm{kJ} \,\mathrm{mol}^{-1}$$) of $$\mathrm{Al}$$ is :

A
487
B
768
C
577
D
856
2
JEE Main 2022 (Online) 28th July Morning Shift
+4
-1

In which of the following pairs, electron gain enthalpies of constituent elements are nearly the same or identical?

(A) Rb and Cs

(B) Na and K

(C) Ar and Kr

(D) I and At

Choose the correct answer from the options given below :

A
(A) and (B) only
B
(B) and (C) only
C
(A) and (C) only
D
(C) and (D) only
3
JEE Main 2022 (Online) 27th July Morning Shift
+4
-1

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.
4
JEE Main 2022 (Online) 26th July Morning Shift
+4
-1

Given two statements below :

Statement I : In $$\mathrm{Cl}_{2}$$ molecule the covalent radius is double of the atomic radius of chlorine.

Statement II : Radius of anionic species is always greater than their parent atomic radius.

Choose the most appropriate answer from options given below :

A
Both Statement I and Statement II are correct.
B
Both Statement I and Statement II are incorrect.
C
Statement I is correct but Statement II is incorrect.
D
Statement I is incorrect but Statement II is correct.
JEE Main Subjects
Physics
Mechanics
Electricity
Optics
Modern Physics
Chemistry
Physical Chemistry
Inorganic Chemistry
Organic Chemistry
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