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How many spectral lines are obtained when electron jumps from n=5 to n=1 hydrogen atom?

3
4
6
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

2.00 x 10¹⁵ s^-1
1.54 x 10¹⁵ s^-1
1.03 x 10¹⁵ s^-1
3.08 x 10¹⁵ s^-1

Which one is the wrong statement?

de-Broglie's wavelength is given by

λ

=h/mv where m= mass of the particle, v= group velocity of the particle
The uncertainty principle is

∆ E x ∆ t \geq h / 4 π

Half-filled and fully filled orbitals have greater stability due to greater exchange energy, greater symmetry and more balanced arrangement
The energy of 2s-orbital is less than the energy of 2p-orbital in case of hydrogen like atoms.

The element Z =114 has been discovered recently. It will belong to which of the following family/group and electronic configuration?

Halogen family, [Rn]5f¹⁴6d¹⁰7s²7p⁵
Carbon family, [Rn]5f¹⁴6d¹⁰7s²7p²
Oxygen family, [Rn]5f¹⁴6d¹⁰7s²7p⁴
Nitrogen family, [Rn]5f¹⁴6d¹⁰7s²7p⁶

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

2
6
10
14

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

d_z²,d_xz
d_xz,d_yz
d_z²,d_x²-y²
d_xy,d_x²-y²

Two electrons occupying the same orbital are distinguished by

Magnetic quantum number
Azimuthal quantum number
Spin quantum number
Principal quantum number

Magnetic moment 2.84 BM is given by (At. no. Ni = 28, Ti = 22, Cr = 24, Co = 27)

Ni²⁺
Ti³⁺
Cr³⁺
Co²⁺

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

s-electrons in Mg (Z=12)
p-electrons in Cl (Z=17)
d-electrons in Fe (Z=26)
p-electrons in Ne (Z=10)

The angular momentum of electrons in d orbital is equal to

\sqrt{6} h / 2 π

\sqrt{2} h

2 \sqrt{3} h

0 h

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

3s 4s 3p 3d
4s 3s 3p 3d
3s 3p 3d 4s
3s 3p 4s 3d

What is the maximum number of orbitals that can be identified with the following quantum numhers?

n=3,l=1,m₁=0

1
2
3
4

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)

6.67 x 10¹⁵
6.67 x 10¹¹
4.42 ^x10-15
4.42 x 10^-18

Magnetic moment of 2.83 BM is given by which of the following ions?

(At no: Ti=22; Cr=24; Mn=25; Ni=28)

Ti³⁺
Ni²⁺
Cr³⁺
Mn²⁺

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?

10
25
50
75

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