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Q.

Which is not the correct statement about the chemistry of 3d and 4f series elements

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a

Europium (II) is more stable than Ce(Il)

b

The energy difference between 3d and 4s orbitals is very little

c

The paramagnetic character in 3d series elements increases from scandium to copper

d

3d elements show more oxidation states than 4f series elements

answer is D.

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Detailed Solution

Elements having unpaired electrons in their outermost orbit, are termed as paramagnetic. In 3d series elements, no. of unpaired electrons increases from Sc to Mn and then decreases from Fe to Zn.

Therefore, paramagnetic character increases from Sc to 

Mn and then decreases from  Fe to Zn.

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