Sign In

JEE MAIN - Chemistry (2022 - 29th June Morning Shift - No. 2)

Which of the following statements are correct?

(A) The electronic configuration of Cr is [Ar] 3d5 4s1.

(B) The magnetic quantum number may have a negative value.

(C) In the ground state of an atom, the orbitals are filled in order of their increasing energies.

(D) The total number of nodes are given by n $$-$$ 2.

Choose the most appropriate answer from the options given below :

(A), (C) and (D) only
(A) and (B) only
(A) and (C) only
(A), (B) and (C) only

Explanation

(A) Cr (24) = 1s2 2s2 2p6 3s2 3p6 3d5 4s1

= [Ar] 3d5 4s1

(B) Magnetic quantum number (m) values ranging from $$-$$ l to + l including zero.

$$\therefore$$ It can have negative value.

(C) According to Aufbau rule, electrons are filled first in these orbitals which have low energy.

$$\therefore$$ Statement C is correct.

(D) We know,

Number of Radial nodes = n $$-$$ l $$-$$ 1

and number of Angular nodes = l

$$\therefore$$ Total nodes = n $$-$$ l $$-$$ 1 + 1 = n $$-$$ 1

Comments (0)

Advertisement