Atomic Structure Test

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Atomic Structure Test - 20

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Weekly Quiz Competition

Question 1
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Direction (Q. Nos. 1-10) This section contains 10 multiple choice questions. Each question has four choices (a), (b), (c) and (d), out of which ONLY ONE option is correct.
Which of the following properties of atom could be explained correctly by Thomson Model of atom?

A
Overall neutrality of atom.

B
Spectra of hydrogen atom.

C
Position of electrons, protons and neutrons in atom.

D
Stability of atom.

Solution

According to Thomson model of atom, the mass of the atom is assumed to be uniformly distributed over the atom. This model was able to explain the overall neutrality of the atom.
Question 2
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The threshold frequency v₀ for a metal is 7.0 x 10¹⁴ s^-1. Radiation of frequency v = 1.0 x 10¹⁵ s^-1 hits the metal. Kinetic energy of the emitted electron is

A
2.0 x 10^-18 J

B
1.60 x 10^-17 J

C
1.60 x 10^-19 J

D
2.0 x 10^-19 J

Solution

By photoelectric effect
Question 3
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Which of the following rules/principles is responsible to rule out the existence of definite paths or trajectories of electrons?

A
Aufbau (ascending energy) rule

B
Hund’s rule of maximum multiples

C
Pauli’s exclusion principle

D
Heisenberg’s uncertainty principle

Solution

By Heisenberg’s uncertainty principle, it is impossible to determine position and momentum simultaneously with same accuracy. Thus, existence of definite path is ruled out.
Question 4
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In an atom, an electron is moving with a speed of 600 ms^-1 with an accuracy of 0.005%. Certainty with which the position of the electron can be located is
[AIEEE 2009]

A
1.52x 10^-4 m

B
5.10 x 10^-3 m

C
1.92 x 10^-3 m

D
3.84 x 10^-3 m

Solution

By Heisenberg’s uncertainty principle
Question 5
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The wavelength (in nanometer) associated with a proton (mass = 1.67 x 10^-27 kg atom^-1) at the velocity of 1.0 x 10^-3 ms^-1 is

A
0.032 nm

B
0.400 nm

C
2.500 nm

D
4.000 nm

Solution

By de-Broglie’s equation
Question 6
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Statement I : It is impossible to determine position and momentum of the moving electron simultaneously with same accuracy.
Statement II : The path of an electron in an atom is clearly defined.

A
Both Statement I and Statement II are correct and Statement II is the correct explanation of Statement I

B
Both Statement I and Statement II are correct and Statement II is not the correct explanation of Statement I

C
Statement I is correct but Statement II is incorrect

D
Statement II is correct but Statement I is incorrect

Solution

Statement 1 is uncertainty principle, according to which we can't locate a moving electron accurately at any instant, which implies there must me certain uncertainty in its path, as path basically gives us the position of electron at various instances.
Question 7
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If the photon of the wavelength 150 pm strikes an atom and one of its inner bound electrons is ejected out with a velocity of 1.5 x 10⁷ ms^-1, then binding energy by which electron is bound to nucleus is

A
1.223 x10^-15 J

B
-1.223x 10^-15 J

C
2.345 x10^-15 J

D
1.428 x10^-15J

Solution

Binding energy is the minimum energy to which electron is bound to nucleus or which is required to eject the electron.
Thus, binding energy = - threshold energy
Question 8
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The position of both, an electron and a helium atom is known within 1.0 mm. Further more the momentum of the electron is known within 5.0 x 10^-26 kg ms^-1. The minimum uncertainty in the measurement of the momentum of the helium atom is

A
50.0 kg ms^-1

B
80.0 kg ms^-1

C
80.0 x 10^-26 kg ms^-1

D
5.0 x 10^-26 kg ms^-1

Solution

and for electron
Question 9
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The wavelength of a neutron with a translatory kinetic energy equal to kT at 300 K is

A
178 pm

B
200 pm

C
17.8 pm

D
20.0 pm

Solution

Kinetic energy = kT
Question 10
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Frequency of a matter wave is equal to

A

B

C

D

Solution

By de-Broglie equation
Question 11
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Direction : Choice the correct combination of elements and column I and coloumn II are given as option (a), (b), (c) and (d), out of which ONE option is correct.
Q.
Neon gas is generally used in sign boards. It emits radiations at wavelength 616 nm.
Match the values derived given in Column II with the corresponding parameter given in Column I.

A
a

B
b

C
c

D
d

Solution