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Structure of Atom · Question 17

NEET (UG) 2021MCQEasy📈 Topic in 0% papers+4−1
1

From the following pairs of ions which one is not an iso-electronic pair?

  1. Fe2+, Mn2+
  2. O2-, F-
  3. Na+, Mg2+
  4. Mn2+, Fe3+

Answer

(1) Fe2+, Mn2+

Solution

Number of electrons in an ion = atomic number − charge.

(1) Fe2+: 26 - 2 = 24 ; Mn2+: 25 - 2 = 23 ⇒ not isoelectronic

(2) O2-: 8 + 2 = 10 ; F-: 9 + 1 = 10 ⇒ isoelectronic

(3) Na+: 11 - 1 = 10 ; Mg2+: 12 - 2 = 10 ⇒ isoelectronic

(4) Mn2+: 25 - 2 = 23 ; Fe3+: 26 - 3 = 23 ⇒ isoelectronic

∴ Fe2+ and Mn2+ is not an isoelectronic pair.

Answer: (1)

NEET (UG) 2021

Keep practising — Structure of Atom

2

The number of protons, neutrons and electrons in 175 71Lu, respectively, are :

  1. 104, 71 and 71
  2. 71, 71 and 104
  3. 175, 104 and 71
  4. 71, 104 and 71
NEET (UG) 2020
3

4d, 5p, 5f and 6p orbitals are arranged in the order of decreasing energy. The correct option is :

  1. 6p > 5f > 4d > 5p
  2. 5f > 6p > 4d > 5p
  3. 5f > 6p > 5p > 4d
  4. 6p > 5f > 5p > 4d
NEET (UG) 2019
4

Which of the following series of transitions in the spectrum of hydrogen atom falls in visible region?

  1. Paschen series
  2. Brackett series
  3. Lyman series
  4. Balmer series
NEET (UG) 2019
5

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.
NEET 2018
6

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
7

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)
8

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)
9

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)
10

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
11

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)

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