QJEEM22Ch1d40: JEE Main 2022 Chemistry - Class 11 JEEM22Ch1d40 Solution: Which of the following statements are correct? (A) The…

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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 :

Accepted Answer

(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

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