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Structure of Atom · Question 21

NEET 2018MCQEasy📈 Topic in 0% papers+4−1
1

Which one is a wrong statement?

  1. Total orbital angular momentum of electron in s-orbital is equal to zero.
  2. An orbital is designated by three quantum numbers while an electron in an atom is designated by four quantum numbers
  3. The electronic configuration of N atom is [figure]
  4. The value of m for dz2 is zero.

Answer

(3) The electronic configuration of N atom is [figure]

Solution

(1) Orbital angular momentum = l(l+1) h2 ; for an s-orbital l = 0 ⇒ orbital angular momentum = 0. Correct statement.

(2) An orbital is fixed by n, l and ml; an electron needs a fourth quantum number, ms. Correct statement.

(3) N (Z = 7): 1s2 2s2 2px1 2py1 2pz1. As per NCERT (Hund's rule of maximum multiplicity), singly occupied degenerate orbitals hold electrons with parallel spins ⇒ all three 2p electrons must have the same spin. In the given box diagram the 2pz electron has the opposite spin ⇒ Hund's rule is violated. Wrong statement.

(4) For dz2, l = 2 and ml = 0. Correct statement.

∴ The wrong statement is (3).

Answer: (3)

NEET 2018

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2

Which one is the wrong statement ?

  1. The uncertainty principle is E t h4
  2. Half filled and fully filled orbitals have greater stability due to greater exchange energy, greater symmetry and more balanced arrangement.
  3. The energy of 2s-orbital is less than the energy of 2p-orbital in case of hydrogen like atoms.
  4. de-Broglie's wavelength is given by = hmv, where m = mass of the particle, v = group velocity of the particle.
NEET 2017
3

Two electrons occupying the same orbital are distinguished by

  1. azimuthal quantum number
  2. spin quantum number
  3. principal quantum number
  4. magnetic quantum number
NEET 2016 (Phase 1)
4

How many electrons can fit in the orbital for which n = 3 and l = 1?

  1. 2
  2. 6
  3. 10
  4. 14
NEET 2016 (Phase 2)
5

Which of the following pairs of d-orbitals will have electron density along the axes ?

  1. dz2, dxz
  2. dxz, dyz
  3. dz2, dx2-y2
  4. dxy, dx2-y2
NEET 2016 (Phase 2)
6

Which is the correct order of increasing energy of the listed orbitals in the atom of titanium ? (At. no. Z = 22)

  1. 4s 3s 3p 3d
  2. 3s 3p 3d 4s
  3. 3s 3p 4s 3d
  4. 3s 4s 3p 3d
AIPMT 2015
7

The number of d-electrons in Fe2+ (Z = 26) is not equal to the number of electrons in which one of the following ?

  1. d-electrons in Fe (Z = 26)
  2. p-electrons in Ne (Z = 10)
  3. s-electrons in Mg (Z = 12)
  4. p-electrons in Cl (Z = 17)
AIPMT 2015 (Cancelled)
8

The angular momentum of electron in 'd' orbital is equal to

  1. 2 3
  2. 0
  3. 6
  4. 2
AIPMT 2015 (Cancelled)
9

What is the maximum number of orbitals that can be identified with the following quantum numbers? n = 3, l = 1, ml = 0

  1. 1
  2. 2
  3. 3
  4. 4
AIPMT 2014
10

Calculate the energy in joule corresponding to light of wavelength 45 nm. (Planck's constant, h = 6.63 10-34 J s, speed of light, c = 3 108 m s-1)

  1. 6.67 1015
  2. 6.67 1011
  3. 4.42 10-15
  4. 4.42 10-18
AIPMT 2014
11

Be2+ is isoelectronic with which of the following ions?

  1. H+
  2. Li+
  3. Na+
  4. Mg2+
AIPMT 2014

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