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Class XI Chemistry Atomic Structure 5

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Question 1

A gas absorbs a photon of 355 nm and emits at two wavelengths. If one of the emissions is at 680 nm, the other is at:

Question 2

Which of the following is the energy of a possible excited state of hydrogen?

Question 3

The orbital angular momentum for an electron revolving in an orbit is given

. This momentum for an s-electron will be given by

Question 4

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⁺?

Question 5

Uncertainty in the position of an electron (mass = 9.1 × 10^–31 kg) moving with a velocity 300 ms^–1, accurteupto 0.001%, will be

Question 6

Which of the following statements in relation to the hydrogen atom is correct?

Question 7

In a multi-electron atom, which of the following orbitals described by the three quantum numbers will have the same energy in the absence of magnetic and electric fields?
(a) n = 1, l = 0, m = 0
(b) n = 2, l = 0, m = 0
(c) n = 2, l = 1, m = 1
(d) n = 3, l = 2, m = 1
(e) n = 3, l = 2, m = 0

Question 8

How many electrons can fit into the orbitals that comprise the 3^rd quantum shell n = 3?

Question 9

A 200g cricket ball is thrown with a speed of 3.0 × 10³ cm sec^–1. What will be its de Broglie’s wavelength? [h = 6.6 × 10^–27 g cm² sec^–1]

Question 10

Magnetic moments of V(Z = 23), Cr(Z = 24), Mn(Z = 25) are x, y, z. Hence -

Question 11

The below configuration is not correct as it violates

Question 12

For the energy levels in an atom which one of the following statement is correct?

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