Among the following, the molecule expected to be stabilized by anion formation is: 

C₂, O₂, NO and F₂

• NO

• C₂

• F₂

• O₂

For any given series of spectral lines of atomic hydrogen, let $∆\overline{\mathrm{v}} = {\overline{\mathrm{v}}}_{\max } - {\overline{\mathrm{v}}}_{\min }$ be the difference in maximum and minimum frequencies in cm^-1. The ratio $∆{\overline{\mathrm{v}}}_{\mathrm{Balmer}}$ is:

• 4 : 1

• 9 : 4

• 5 : 4

• 27.5

The graph between Ψ² and r(radial diatance) is shown beow . This represents

• 2s orbital

• 2p orbital

• 3s orbital

• 1s orbital

The ratio of the shortest wavelength of two spectral series of hydrogen spectrum is found to be about 9. The spectral series are:

• Paschen and Pfund

• Lyman and Paschen

• Brackett and Pfund

• Balmer and Brackett

525.

Two electrons occupying the same orbital are distinguished by

• Magnetic quantum number

• Azimuthal quantum number

• Spin quantum number

• Spin quantum number

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

• Ni²⁺

• Ti³⁺

• Cr³⁺

• Cr³⁺

The angular momentum of electrons in d orbital is equal to

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

n=3, l =1, m₁ = 0

• 1

• 2

• 3

• 3

Calculate the energy in joule corresponding to light of wavelength 45mm: (Planck's constant h=6.63 x10^-34)Js; speed of light c= 3 x 10⁸ ms^-1)

• 6.67 x 10¹⁵

• 6.67 x 10¹¹

• 4.42 x 10^-15

• 4.42 x 10^-15

The value of Planck's constant is 6.63 x 10^-34 Js. The speed of light is 3 x10¹⁷ nms^-1 . Which value is closet to the wavelength in nanometer of a quantum of light with frequency of 6 x 10¹⁵ s^-1 ?

• 10

• 25

• 50

• 50