Structure of Atom

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.

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

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

1. 2
2. 6
3. 10
4. 14

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

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

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)

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

1. 2 3
2. 0
3. 6
4. 2

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

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

Be2+ is isoelectronic with which of the following ions?

1. H+
2. Li+
3. Na+
4. Mg2+