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Structure of Atom · Question 27

AIPMT 2015 (Cancelled)MCQEasy📈 Topic in 0% papers+4−1
1

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)

Answer

(4) p-electrons in Cl (Z = 17)

Solution

Fe2+ : [Ar] 3d6 ⇒ 6 d-electrons.

(1) Fe : [Ar] 3d6 4s2 ⇒ 6 d-electrons.

(2) Ne : 1s2 2s2 2p6 ⇒ 6 p-electrons.

(3) Mg : 1s2 2s2 2p6 3s2 ⇒ 6 s-electrons.

(4) Cl : 1s2 2s2 2p6 3s2 3p5 ⇒ 6 + 5 = 11 p-electrons.

∴ Only the p-electrons of Cl are not equal to 6.

Answer: (4)

AIPMT 2015 (Cancelled)

Keep practising — Structure of Atom

2

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

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

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
4

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
5

Be2+ is isoelectronic with which of the following ions?

  1. H+
  2. Li+
  3. Na+
  4. Mg2+
AIPMT 2014
6

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
7

Based on equation E = -2.178 10-18 J ( Z2n2 ), certain conclusions are written. Which of them is not correct ?

  1. Equation can be used to calculate the change in energy when the electron changes orbit.
  2. For n = 1, the electron has a more negative energy than it does for n = 6 which means that the electron is more loosely bound in the smallest allowed orbit.
  3. The negative sign in equation simply means that the energy of electron bound to the nucleus is lower than it would be if the electrons were at the infinite distance from the nucleus.
  4. Larger the value of n, the larger is the orbit radius.
NEET 2013
8

The value of Planck's constant is 6.63 10-34 J s. The speed of light is 3 1017 nm s-1. Which value is closest to the wavelength in nanometer of a quantum of light with frequency of 6 1015 s-1 ?

  1. 50
  2. 75
  3. 10
  4. 25
NEET 2013
9

According to law of photochemical equivalence the energy absorbed (in ergs/mole) is given as (h = 6.62 10-27 ergs, c = 3 1010 cm s-1, NA = 6.02 1023 mol-1)

  1. 1.196 108
  2. 2.859 105
  3. 2.859 1016
  4. 1.196 1016
NEET 2013 (Karnataka)
10

The orbital angular momentum of a p-electron is given as

  1. h 2
  2. 3 h2
  3. 32 h
  4. 6 h2
AIPMT 2012 (Mains)
11

Maximum number of electrons in a subshell with l = 3 and n = 4 is

  1. 14
  2. 16
  3. 10
  4. 12
AIPMT 2012 (Prelims)

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