The number of electrons that can be fit into the orbital for which n = 3 and l = 1, is:

1. 2

2. 6

3. 10

4. 14

Which of the following pairs of d-orbitals will have electron density along the axes?

1. d_z²,d_xz

2. d_xz,d_yz

3. d_z²,d_x²-y²

4. d_xy,d_x²-y²

Two electrons occupying the same orbital are distinguished by

(1) Magnetic quantum number

(2) Azimuthal quantum number

(3) Spin quantum number

(4) Principal quantum number

The electronic configurations of Eu (Atomic no. 63), Gd (Atomic no. 64) and Tb (Tb Atomic no. 65) are

1. [Xe]4f⁶5d¹6s², [Xe]4f⁷5d¹6s² and [Xe]4f⁹6s²

2. [Xe]4f⁶5d¹6s², [Xe]4f⁷5d¹6s² and [Xe]4f⁸5d¹6s²

3. [Xe]4f⁷6s², [Xe]4f⁷5d¹6s² and [Xe]4f⁹6s²

4. [Xe]4f⁷6s², [Xe]4f⁸6s² and [Xe]4f⁸5d¹6s² 

The magnetic moment of 2.84 BM can be shown by:  

(At. no. Ni = 28, Ti = 22, Cr = 24, Co = 27)

1. Ni²⁺

2. Ti³⁺

3. Cr³⁺

4. Co²⁺

The number of d-electrons in Fe²⁺ (Z=26) is not equal to the number of electrons in

which one of the following?

1. s-electrons in Mg (Z=12)

2. p-electrons in Cl (Z=17)

3. d-electrons in Fe (Z=26)

4. p-electrons in Ne (Z=10)

Which is the correct order of increasing energy of the listed orbitals in the atom of

titanium?

1. 3s 4s 3p 3d                   

2. 4s 3s 3p 3d

3. 3s 3p 3d 4s                   

4. 3s 3p 4s 3d

Calculate the energy in Joule corresponding to light of wavelength 45 nm : (Planck's

constant h = 6.63 x 10^-34 Js; speed of light c = 3 x 10⁸ ms^-1)

1. 6.67 x 10¹⁵                             

2. 6.67 x 10¹¹

3. 4.42 ^x10-15                             

4. 4.42 x 10^-18

The value of Planck's constant is 6.63 x 10^-34 Js. The speed of light is 3 x 10¹⁷ nms^-1.

Which value is closest to the wavelength in nanometer of a quantum of light with the

frequency of 6 x 10¹⁵ s^-1?

1. 10

2. 25

3. 50

4. 75

What is the maximum numbers of electrons that can be associated with the following set

of quantum numbers?

n=3, l = 1 and m=-1

1. 10

2. 6

3. 4

4. 2