Structure of Atom

An electronic transition in hydrogen atom results in the formation of H_α line of hydrogen in Lyman series, the energies associated with the electron in each of the orbits involved in the transition (in kcal mol^-1) are 

• -313,6, - 34.84

• -313.6, - 78.4

• -78.4,- 34.84

• -78.4,-19.6

The velocities of two particles A and B are 0.05 and 0.02 ms^-1 respectively. The mass of B is five times the mass of A. The ratio of their de-Broglie's wavelength is

• 2 : 1

• 1 : 4

• 1 : 1

• 4 : 1

The wavelengths of electron waves in two orbits is 3 : 5. The ratio of kinetic energy of electrons will be 

• 25 : 9

• 5 : 3

• 9 : 25

• 3 : 5

Which one of the following conditions is incorrect for a well behaved wave function (Ψ)?

• Ψ must be fine

• Ψ must be single valued

• Ψ must be infinite

• Ψ must be continuous

Which one of the following frequencies of radiation (in Hz) has a wavelength of 600 nm?

• 2.0 × 10¹³ 

• 5.0 × 10¹⁶ 

• 2.0 × 10¹⁴ 

• 5.0 × 10¹⁴ 

According to Bohr's theory which one of the following values of angular momentum of hydrogen atom is not permitted?

• $\frac{1.25 \mathrm{h}}{\mathrm{\pi }}$

• $\frac{\mathrm{h}}{\mathrm{\pi }}$

• $\frac{1.5 \mathrm{h}}{\mathrm{\pi }}$

• $\frac{0.5 \mathrm{h}}{\mathrm{\pi }}$

The number of radial nodes of 3s and 2p orbitals respectively are

• 0, 2

• 2, 0

• 1, 2

• 2, 1

The quantum number which explains the line spectra observed as doublets in case of hydrogen and alkali metals and doublets and triplets in case of alkaline earth metals is

• spin

• azimuthal

• magnetic

• principal

A compound absorbs light in the wavelength region 490-500 nm. Its complementary colour is

• red

• blue

• orange

• blue-green

Which of the following sets of quantum numbers is correct for an electron in 3d-orbital?

• n = 3; l = 2; m = -3; s = +$\frac{1}{2}$

• n = 3; l = 3; m = +3; s = -$\frac{1}{2}$

• n = 3; l = 2; m = -2; s = +$\frac{1}{2}$

• n = 3; l = 2; m = -3; s = -$\frac{1}{2}$