Statement I : Ferromagnetism is considered as an extreme form of paramagnetism. [2025]

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Q.
Given below are two statements:

Statement I : Ferromagnetism is considered as an extreme form of paramagnetism.

Statement II : The number of unpaired electrons in a ${Cr}^{2 +}$ ion (Z = 24) is the same as that of a ${Nd}^{3 +}$ ion (Z = 60).

In the light of the above statements, choose the correct answer from the options given below: [2025]

1 Statement I is true but Statement II is false.

2 Statement I is false but Statement II is true.

3 Both Statement I and Statement II are true.

4 Both Statement I and Statement II are false.

Ans.
(1)

Ferromagnetism is an extreme form of paramagnetism hence, statement-I is true.

Electronic configuration of ${Cr}^{2 +} : [Ar] 3 d^{4}$ thus, number of unpaired electrons is 4. Electronic configuration of ${Nd}^{3 +} : [Xe] 4 f^{3}$ thus, number of unpaired electrons is 3. Hence, statement-II is false.

Solution

1 Statement I is true but Statement II is false.

2 Statement I is false but Statement II is true.

3 Both Statement I and Statement II are true.

4 Both Statement I and Statement II are false.

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Solution

1 Statement I is true but Statement II is false.

2 Statement I is false but Statement II is true.

3 Both Statement I and Statement II are true.

4 Both Statement I and Statement II are false.

Ans. (1) Ferromagnetism is an extreme form of paramagnetism hence, statement-I is true. Electronic configuration of Cr2+:[Ar]3d4 thus, number of unpaired electrons is 4. Electronic configuration of Nd3+:[Xe]4f3 thus, number of unpaired electrons is 3. Hence, statement-II is false.

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