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Q.

Assertion (A) : Many trivalent lanthanoid ions are coloured both in solid state and in aqueous solutions
Reason (R) : Colour of these ions may be attributed to the presence of f-electrons
 

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a

A is true R is false

b

A and R is true R is not explanation of A

c

A and R is true R is the correct explanation of A

d

Both A and R is false

answer is A.

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Colour of ions due to f-electrons.

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