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Question
Explain the following with suitable examples:
Antiferromagnetism
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Solution
The presence of unpaired electrons predicts paramagnetism or ferromagnetism in antiferromagnetic substances, despite their net zero magnetic moment.
Antiferromagnetic substances have domain structures similar to ferromagnetic substances but are oppositely orientated. The oppositely orientated domains cancel out each other’s magnetic moments.
Antiferromagnetism comes when magnetic moments align in a compensating fashion, yielding a zero net moment. MnO is a substance of this class.
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Explain the following with suitable examples:
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Give reason for the following :
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Compare dia, para and ferromagnetism.
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Substances which are weakly repelled in magnetic field are known as ____________.
All those atoms or molecules which have an odd number of electrons are
When heated to high temperature, ferromagnetic substance changes to ____________.
Which of the following arrangements shows schematic alignment of magnetic moments of antiferromagnetic substances?
Which of the following statements is not true?
A ferromagnetic substance becomes a permanent magnet when it is placed in a magnetic field becuase ______.
Which of the following is not a ferroelectric compound?
Some of the polar crystals when heated produces small electrical current. This phenomenon is called ______.
Which of the following statements are correct?
- Electric monopoles do not exist whereas magnetic monopoles exist.
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- χ = -1 is the condition for a perfect diamagnetic material, where x is its magnetic susceptibility.
The susceptibility of a paramagnetic material is 99. The permeability of the material in Wb/A-m is ______.
[permeability of the free space μ0 = 4π × 10-7 Wb/A - m]
The value of aluminium susceptibility is 2.2 × 10-5. The percentage increase in the magnetic field if space within a current carrying toroid is filled with aluminium is `"x"/10^4`. Then the value of x is ______.
Which one of the following compounds is diamagnetic and colourless?
Give a reason for the following:
Cu+2 salts are paramagnetic, while Cu+ salts are diamagnetic.
The metal complex ion that is paramagnetic is ______.
(Atomic number of Fe = 26, Cu = 29, Co = 27 and Ni = 28)
