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Question

Nickel shows ferromagnetic property at room temperature. If the temperature is increased beyond Curie temperature, then it will show

A
anti ferromagnetism
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B
no magnetic property
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C
diamagnetism
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D
paramagnetism
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Solution

The correct option is D paramagnetism
Nickel exhibits ferromagnetism due to a quantum physical effect called exchange coupling.

If the temperature of a ferromagnetic material is raised above a certain value, called curie temperature, the coupling ceases to be effective.

Most such material then becomes simply paramagnetic.

Hence option (D) is the correct answer.

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