Assertion : Mg1122 emits a positron giving Mg1222.

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 Multiple Choice QuestionsMultiple Choice Questions

401.

Azimuthal quantum number defines :

  • e/m ratio of electron

  • angular momentum of electron

  • spin of electron

  • magnetic momentum of electron


402.

For principle quantum number n = 4, the total number of orbitals having l= 3 is

  • 3

  • 7

  • 5

  • 9


403.

Assertion : Nuclear binding energy per nucleon is in the order - Be49 >Li37 >He24

Reason : Binding energy per nucleon increases linearly with difference in number of neutrons and protons.

  • If both assertion and reason are true and reason is the correct explanation of assertion

  • If both assertion and reason are true but reason is not the correct explanation of assertion

  • If assertion is true but reason is false

  • If both assertion and reason are false.


404.

The quantum number m of a free gaseous atom is associated with

  • the effective volume of the orbital

  • the shape of the orbital

  • the spatial orientation of the orbital

  • the energy of the orbital in the absence of a magnetic field.


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405.

Assertion : Mg1122 emits a positron giving Mg1222.

Reason : In β+ emission neutron is transformed into proton.

  • If both assertion and reason are true and the reason is the correct explanation of the assertion.

  • If both assertion and reason are true and the reason is not the correct explanation of the assertion.

  • If assertion is true but reason is false.

  • If both assertion and reason are false.


D.

If both assertion and reason are false.

11Na22 → 12Mg221β0

The above reaction involves β- particle emission. While positron emission is due to the conversion of proton into neutron.

p11  n01 + β10


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406.

Which of the following arrangements is possible?

  • n l m s
    5 2 2 +12
  • n l m s
    2 2 0 -12
  • n l m s
    3 -2 1 +12
  • n l m s
    0 0 1 +12

407.

Which of the following is the correct sequence of atomic weights of the given elements?

  • Ni> Co> Fe

  • Fe> Co> Ni

  • Co> Fe> Ni

  • Co> Ni> Fe


408.

Assertion : Hydrogen nuclei combines to form helium nuclei then energy is released.

Reason: Binding energy/nucleon of He is greater than hydrogen.

  • If both Assertion and Reason are true and Reason is the correct explanation of Assertion

  • If both Assertion and Reason are true but Reason is not the correct explanation of Assertion.

  • If Assertion is true but Reason is false.

  • If Assertion is false but Reason is true.


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409.

Assertion : Water is used as a moderator in nuclear reactor.

Reason : Moderator is a light substance that absorb neutrons.

  • If both Assertion and Reason are true and Reason is the correct explanation of Assertion.

  • If both Assertion and Reason are true but Reason is not the correct explanation of Assertion.

  • If Assertion is true but Reason is false.

  • If Assertion is false but Reason is true.


410.

Assertion : Ionisation potential of B (atomic no.5) is less than Be (atomic no. 4).

Reason : The first electron released from Be is of p-orbital but that from B is of s-orbital.

  • If both Assertion and Reason are true and Reason is the correct explanation of Assertion.

  • If both Assertion and Reason are true but Reason is not the correct explanation of Assertion.

  • If Assertion is true but Reason is false.

  • If Assertion is false but Reason is true.


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