1
JEE Main 2023 (Online) 6th April Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

Which one of the following elements will remain as liquid inside pure boiling water?

A
Li
B
Br
C
Cs
D
Ga
2
JEE Main 2023 (Online) 6th April Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

Group-13 elements react with $$\mathrm{O}_{2}$$ in amorphous form to form oxides of type $$\mathrm{M}_{2} \mathrm{O}_{3}~(\mathrm{M}=$$ element). Which among the following is the most basic oxide?

A
Al$$_2$$O$$_3$$
B
TI$$_2$$O$$_3$$
C
B$$_2$$O$$_3$$
D
Ga$$_2$$O$$_3$$
3
JEE Main 2023 (Online) 6th April Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

The difference between electron gain enthalpies will be maximum between:

A
Ar and Cl
B
Ne and Cl
C
Ne and F
D
Ar and F
4
JEE Main 2023 (Online) 31st January Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language
Which of the following elements have half-filled f-orbitals in their ground state?

(Given : atomic number $\mathrm{Sm}=62 ; \mathrm{Eu}=63 ; \mathrm{Tb}=65 ; \mathrm{Gd}=64, \mathrm{Pm}=61$ )

A. $\mathrm{Sm}$

B. Eu

C. $\mathrm{Tb}$

D. Gd

E. $\mathrm{Pm}$

Choose the correct answer from the options given below :
A
B and D only
B
A and $B$ only
C
$C$ and $\mathrm{D}$ only
D
A and E only
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