Azimuthal quantum number defines :

• e/m ratio of electron

• angular momentum of electron

• spin of electron

• magnetic momentum of electron

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

• 3

• 7

• 5

• 9

Assertion : Nuclear binding energy per nucleon is in the order - ${}_4{}^9\mathrm{Be} >{}_3{}^7\mathrm{Li} >{}_2{}^4\mathrm{He}$

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.

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.

405.

Assertion : ${}_{11}{}^{22}\mathrm{Mg}$ emits a positron giving ${}_{12}{}^{22}\mathrm{Mg}$.

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.

Which of the following arrangements is possible?

• n	l	m	s
  5	2	2	$+\frac{1}{2}$

• n	l	m	s
  2	2	0	$-\frac{1}{2}$

• n	l	m	s
  3	-2	1	$+\frac{1}{2}$

• n	l	m	s
  0	0	1	$+\frac{1}{2}$

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

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.

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.

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.