JEE Main 2023 (Online) 6th April Evening Shift | Periodic Table & Periodicity Question 77 | Chemistry

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?

Al$$_2$$O$$_3$$

TI$$_2$$O$$_3$$

B$$_2$$O$$_3$$

Ga$$_2$$O$$_3$$

JEE Main 2023 (Online) 6th April Morning Shift

MCQ (Single Correct Answer)

-1

The difference between electron gain enthalpies will be maximum between :

Ar and Cl

Ne and Cl

Ne and F

Ar and F

JEE Main 2023 (Online) 31st January Evening Shift

MCQ (Single Correct Answer)

-1

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 :

B and D only

A and $B$ only

$C$ and $\mathrm{D}$ only

A and E only

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