Which of the following statements are true. (i) L a 3 + ( Z = 57 ) a n d L u 3 + ( Z = 71 ) do not show any colour in solutions. (ii) Among the divalent cations in the first series of transition elements, manganese exhibits the maximum paramagnetism.

Question

Which of the following statements are true. (i) L a 3 + ( Z = 57 ) a n d L u 3 + ( Z = 71 ) do not show any colour in solutions. (ii) Among the divalent cations in the first series of transition elements, manganese exhibits the maximum paramagnetism., (i),(ii), (ii), (i), None of these

MARKS App · Accepted Answer

(i) Colour of lanthanoids ions may be attributed due to the presence of f-electrons. La 3+ ion do not show any colour, because of empty f-orbital. Lu 3+ ion do not show any colour, because of completely field f-orbitals. (ii) Since M n 2 + ( Z = 25 ) = 3 d 5 , 4 s 0 has maximum number of unpaired electrons.therefore Mn 2+ exhibit maximum paramagnetism.

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