Class XI Chemistry Atomic Structure 4

Attempt now to get your rank among 1732 students!

Question 1

When electronic transition occurs from higher energy state to a lower energy state with energy difference E eV, wavelength of line emitted is equal to

• A1.2400 *10^-10/E m
• B1.3397*10^-10/E m
• C1.4322*10^-10/E m
• D1.2387*10^-10/E m

Question 2

What is the Bohr’s radius of 4^th orbit of He⁺ in Å?

• A5.23 Å
• B3.23 Å
• C6.23 Å
• D4.23 Å

Question 3

Which statement does not form part of Bohr’s model of hydrogen atom?

• AEnergy of orbit is quantized
• BElectron in the orbit nearest to the nucleus is in the lowest energy
• CElectrons revolve in different orbits around nucleus
• DThe position and velocity of electrons in orbit cannot be determined simultaneously

Question 4

Number of α-particles scattered at an angle θ in Rutherford's experiment are -

• Adirectly proportional to K.E²
• Bdirectly proportional to z⁴
• Cinversely proportional to e⁴
• Dinversely proportional to K.E²

Question 5

An electron, a proton and an alpha particle have kinetic energies of 16E, 4E and E respectively. What is the qualitative order of their de-Broglie wavelengths?

• Aλ_e > λ_p = λ_α
• Bλ_p = λ_α > λ_e
• Cλ_p > λ_e > λ_α
• Dλ_α < λ_e >> λ_p

Question 6

The wave number of the first line in the Balmer series of hydrogen atom is 15200 cm^–1. What is the wave number of the first line in the Balmer series of Be³⁺?

• A2.432 10⁵ cm^–1
• B15200 cm^–1
• C4 × 15200 cm^–1
• D2 × 15200 cm^–1

Question 7

The quantum numbers of four electrons (e1 to e4) are given below

The correct order of decreasing energy of these electrons is:

• Ae4>e3>e2>e1
• Be2>e3>e4>e1
• Ce3>e2>e4>e1
• Dnone

Question 8

The maximum energy is present in any electron at

• ANucleus
• BGround state
• CFirst excited state
• DInfinite distance from the nucleus

• 1732 attempts
• 17 upvotes
• 68 comments