When any radioactive element emits β particle, some product

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 Multiple Choice QuestionsMultiple Choice Questions

91.

Identify the nuclear reaction that differs from the rest.

  • γ- decay

  • κ- capture

  • Positron emission

  • β-decay


92.

The radius of the first Bohr orbit of hydrogen atom is 0.529 Å. The radius of the third orbit of H+ will be

  • 8.46 Å

  • 0.705 Å

  • 1.59 Å

  • 4.29 Å


93.

Which diagram best represents the appearance of the line spectrum of atomic hydrogen in the visible region?


94.

The correct set of quantum numbers (n, and m respectively) for the unpaired electron of chlorine atom is :

  • 2, 1, 0

  • 2, 1, 1

  • 3, 1, 1

  • 3, 2, 1


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95.

The relationship between the energy E1 of the radiation with a wavelength 8000 Å and the energy E2 of the radiation with a wavelength Å 16000  is:

  • E1 = 6E2

  • E1 = 2E2

  • E1 = 4E2

  • E1 = 4E2


96.

Calculate the mass loss in the following.

H12 + H13  H24 + n01

[Given the masses : 2H = 2.014;3H = 3.016; He = 4.004; n = 1.008 amu]  

  • 0.018 amu

  • 0.18 amu

  • 0.0018 amu

  • 1.8 amu


97.

The observation that the ground state of nitrogen atom has 3 unpaired electrons in its electronic configuration and not otherwise is associated with:

  • Pauli's exclusion principle

  • Hund's rule of maximum multiplicity

  • Heisenberg's uncertainty relation

  • Ritz combination principle


98.

The first artificial disintegration of an atomic nucleus was achieved by

  • Geiger

  • Wilson

  • Madam Curie

  • Rutherford


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99.

When any radioactive element emits β particle, some product is obtained. They both are

  • isotopes

  • isobars

  • isomers

  • isotoes


B.

isobars

Isobars are atoms of different elements having same atomic masses but different atomic numbers. Loss of β-particles results in an increase in atomic number by 1 whereas atomic mass remains same. 

xAy - β → x + 1Zy

An isotope is a form of a chemical element whose atomic nucleus contains a specific number of neutrons, in addition to the number of protons that uniquely defines the element.

Isomers are molecules that have the same molecular formula but have different structures.

Isotones are elements having the same number of neutrons.


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100.

Electrical field is used to deflect

  • α and β particles

  • α and γ particles

  • α,  β and γ particles

  • β and γ particles


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