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Structure of Atom

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

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)

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Ques. 2NEET 2016 (Phase 1)

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
Ques. 3NEET 2016 (Phase 2)

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

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

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
Ques. 5AIPMT 2015

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
Ques. 6AIPMT 2015 (Cancelled)

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)
Ques. 7AIPMT 2015 (Cancelled)

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

  1. 2 3
  2. 0
  3. 6
  4. 2
Ques. 8AIPMT 2014

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
Ques. 9AIPMT 2014

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
Ques. 10AIPMT 2014

Be2+ is isoelectronic with which of the following ions?

  1. H+
  2. Li+
  3. Na+
  4. Mg2+
Ques. 11NEET 2013

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

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