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Structure of Atom · Question 22

NEET 2017MCQEasy📈 Topic in 12% papers+4−1
1

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.

Answer

(3) The energy of 2s-orbital is less than the energy of 2p-orbital in case of hydrogen like atoms.

Solution

(1) E t h4 is a valid form of the uncertainty principle ⇒ correct.

(2) As per NCERT, half-filled and fully filled subshells are extra stable due to symmetry and larger exchange energy ⇒ correct.

(3) As per NCERT, in hydrogen and hydrogen-like species the energy of an orbital depends only on n ⇒ 2s and 2p are degenerate (equal energy) ⇒ statement is wrong.

(4) = hmv, v being the (group) velocity of the particle ⇒ correct.

Answer: (3)

NEET 2017

Keep practising — Structure of Atom

2

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)
3

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)
4

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)
5

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
6

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)
7

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

  1. 2 3
  2. 0
  3. 6
  4. 2
AIPMT 2015 (Cancelled)
8

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
9

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
10

Be2+ is isoelectronic with which of the following ions?

  1. H+
  2. Li+
  3. Na+
  4. Mg2+
AIPMT 2014
11

What is the maximum number of electrons that can be associated with the following set of quantum numbers ? n = 3, l = 1 and m = -1

  1. 4
  2. 2
  3. 10
  4. 6
NEET 2013

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