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Q.

Highest oxidation state exhibited by a lanthanide element is 

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a

 + 3 

b

+ 4 

c

+ 8

d

 + 7 

answer is B.

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Detailed Solution

The elements with atomic numbers ranging from 58 to 71 after the element lanthanum, are known as lanthanides. Due to the extremely low frequency of these elements, they are known as rare earth metals.
It is well-known that lanthanides have a +3 oxidation state. Cerium and promethium display the highest oxidation state, +4. 

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