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Q.

Pick out the correct statements 

i) Susceptibility of a diamagnetic substance is high and negative

ii) In paramagnetic substance, the intrinsic magnetic moment is not zero

iii) When a paramagnetic substance is heated, it becomes ferromagnetic

iv) Ferro magnetic material becomes paramagnetic above a certain temperature  

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a

iii and iv

b

ii and iv

c

i and iii

d

ii and iii

answer is D.

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Detailed Solution

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In a paramagnetic substances, intrinsic magnetic moment is not zero. Further, in the absence of external magnetic field, spin exchange interaction is present. 

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