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Q.

Colour exhibited by divalent Sm in aqueous solutions
 

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a

greenish yellow

b

  yellowish brown

c

dark blue

d

 blood red 

answer is C.

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Detailed Solution

Sm = 62

   Sm = [Xe] 4f 6 6s2 

  Sm2+ = [Xe] 4f 6

Hence, due to the presence of unpaired electrons the color will be blood red. 

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