General
✓✗Electronic configuration of calcium atom can be written as
- [Ne] 4p2
- [Ar] 4s2
- [Ne] 4s2
- [Kr] 4p2
General
✓✗In hydrogen atom, energy of first excited state is –3.4 eV. Then find out K.E. of same orbit of hydrogen atom
- +3.4 eV
- +6.8 eV
- –13.6 eV
- +13.6 eV
General
✓✗How many electrons can fit in the orbital for which n = 3 and 
= 1?
= 1?- 2
- 6
- 10
- 14
General
✓✗The energies E1 and E2 of two radiations are 25 eV and 50 eV respectively. The relation between their wavelengths i.e., l1 and l2 will be
- l1 = l2
- ll = 2l2
- l1 = 4l2
-
l1 =
l2
General
✓✗Given: The mass of electron is 9.11 ´ 10–31 kg, Planck constant is 6.626 ´ 10–34 J s, the uncertainty involved in the measurement of velocity within a distance of 0.1 Å is
- 5.79 ´ 105 m s–1
- 5.79 ´ 106 m s–l
- 5.79 ´ 107 m s–1
- 5.79 ´ 108 m s–1
General
✓✗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)
- 6.67 ´ 1015
- 6.67 ´ 1011
- 4.42 ´ 10–15
- 4.42 ´ 10–18
General
✓✗Which of the following pairs of d-orbitals will have electron density along the axes?
-
, dxz
- dxz, dyz
-
,
-
dxy,
General
✓✗The radius of hydrogen atom in the ground state is 0.53 Å. The radius of Li2+ ion (atomic number = 3) in a similar state is
- 0.53 Å
- 1.06 Å
- 0.17 Å
- 0.265 Å
General
✓✗Be2+ is isoelectronic with which of the following ions?
- H+
- Li+
- Na+
- Mg2+
General
✓✗The number of d-electrons in Fe2+ (Z = 26) is not equal to the number of electrons in which one of the following?
- d-electrons in Fe (Z = 26)
- p-electrons in Ne (Z = 10)
- s-electrons in Mg (Z = 12)
- p-electrons in Cl (Z= 17)
General
✓✗In a Bohr's model of an atom, when an electron jumps from n = 1 to n = 3, how much energy will be emitted or absorbed?
- 2.389 ´ 10–12 ergs
- 0.239 ´ 10–10 ergs
- 2.15 ´ 10–11 ergs
- 0.1936 ´ 10–10 ergs
General
✓✗The spectrum of He is expected to be similar to that
- H
- Li+
- Na
- He+
General
✓✗For which of the following sets of four quantum numbers, an electron will have the highest energy?
- n 3, l 2, m 1, s +1/2
- n 4, l 2, m –1, s +1/2
- n 4, l 1, m 0, s –1/2
- n 5, l 0, m 0, s –1/2
General
✓✗What is the maximum numbers of electrons that can be associated with the following set of quantum numbers?
n = 3,
= 1 and m = –1
n = 3,
= 1 and m = –1- 4
- 2
- 10
- 6
General
✓✗Which is the correct order of increasing energy of the listed orbitals in the atom of titanium? (At. no. Z = 22)
- 4s 3s 3p 3d
- 3s 3p 3d 4s
- 3s 3p 4s 3d
- 3s 4s 3p 3d