When an electron jumps from n=5 to n=1 in a hydrogen atom, the number of spectral lines obtained is 

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

The frequency of radiation emitted when the electron falls from n=4 to n=1 in a hydrogen atom will be 

(Given ionization energy of H = 2.18 x 10^-18J atom^-1 and h=6.625 x 10^-34Js

1. 2.00 x 10¹⁵ s^-1

2. 1.54 x 10¹⁵ s^-1

3. 1.03 x 10¹⁵ s^-1

4. 3.08 x 10¹⁵ s^-1

Which one is the wrong statement?

The group number and electronic configuration of  element Z =114 is: 

1. Halogen family, [Rn]5f¹⁴6d¹⁰7s²7p⁵

2. Carbon family, [Rn]5f¹⁴6d¹⁰7s²7p²

3. Oxygen family, [Rn]5f¹⁴6d¹⁰7s²7p⁴

4. Nitrogen family, [Rn]5f¹⁴6d¹⁰7s²7p⁶

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)