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Magnetic Properties

Which of the ...

Question

Which of the following statements is not correct about magnetic behaviour of substances?

A

Diamagnetic substances are repelled by an applied magnetic field.

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B

Paramagnetic substances are attracted by an applied magnetic field.

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C

Magnetic moment of n unpaired electrons is given by

μ = \sqrt{n} (n - 2)

B.M.

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D

Magnetic moment increases as the number of unpaired electrons increases.

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Solution

The correct option is B Magnetic moment of n unpaired electrons is given by $μ = \sqrt{n} (n - 2)$ B.M.
Diamasnetic substances are repelled by an applied magnetic field.[since,it has no unpaired electrons]
paramagnetic substances,due to presence of unpaired free electrons in them,are attracted by an applied magnetic field.
Magnetic moment of nunpaired electrons is given by the formula,magnetic moment $μ = \sqrt{n (n + 2)}$ .

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Similar questions

The substances which contain species with unpaired electrons in their orbitals behave as paramagnetic substances. Such substances are weakly attracted by the magnetic field. The paramagnetism is expressed in terms of magnetic moment. The magnetic moment is related to the number of unpaired electrons according to the following relation:
Magnetic moment,

μ = \sqrt{n (n + 2)} B M

n =

number of unpaired electrons.

B M

stands for Bohr magneton, a unit of magnetic moment.

1 B M = \frac{e h}{4 π m c} = 9.27 \times 10^{- 24} {A m}^{2}

J T^{- 1}

Which of the following ions are diamagnetic?

The substances which contain species with unpaired electrons in their orbitals behave as paramagnetic substances. Such substances are weakly attracted by the magnetic field. The paramagnetism is expressed in terms of the magnetic moment. The magnetic moment is related to the number of unpaired electrons according to the following relation:

Magnetic moment,

μ = \sqrt{n (n + 2)} B M

n =

number of unpaired electrons.

B M

stands for Bohr magneton, a unit of the magnetic moment.

1 B M = \frac{e h}{4 π m c} = 9.27 \times 10^{- 24} {A m}^{2}

J T^{- 1}

d

-block element has a magnetic moment

5.92 B M

. Select the ion among the following

The substances which contain species with unpaired electrons in
their orbitals behave as paramagnetic substances. Such substances
are weakly attracted by the magnetic field. The paramagnetism is
expressed in terms of magnetic moment. The magnetic moment is
related to the number of unpaired electrons according to the
following relation:
Magnetic moment,

μ = \sqrt{n (n + 2)} B M

n =

number of unpaired electrons.

B M

stands for Bohr magneton, a unit of magnetic moment.

1 B M = \frac{e h}{4 π m c} = 9.27 \times 10^{- 24} {A m}^{2}

J T^{- 1}

Which of the following ions has magnetic moment equal to that of

{T i}^{3 +}

?

If hydrogen atoms (in the ground state) are passed through an homogeneous magnetic field, the beam is split into two parts. This interaction with the magnetic field shows that the atoms must have magnetic moment. However, the moment cannot be due to the orbital angular momentum since

φ = 0

. Hence one must assume existence of intrinsic angular momentum, which as the experiment shows, has only two permitted orientations.
Spin of the electron produces angular momentum equal to

s = \sqrt{s (s + 1)} \frac{h}{2 π}

s = + \frac{1}{2}

Total spin of an atom

= + \frac{n}{2} o r - \frac{n}{2}

where n is the number of unpaired electron.
The Substance which contain species with unpaired electrons in their orbitals behave as paramagnetic substances. The paramagnetism is expressed in terms of magnetic moment.
The magnetic moment of an atom

μ = \sqrt{s (s + 1)} \frac{e h}{2 π m c} = \sqrt{\frac{n}{2} (\frac{n}{2} + 1)} \frac{e h}{2 π m c}

s = \frac{n}{2}

μ_{s} = \sqrt{n (n + 2)}

B.M
n-number of upaired electrons
1.B.M. (Bohr magneton)

= \frac{e h}{4 π m c}

If magnetic moment is zero the substance is di-magnetic.

Which of the following ion has highest magnetic moment?

Q. The magnetic moment

μ

, of transition metals is related to the number of unpaired electrons, n as:

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