MCQ
Paramagnetic and coloured ions are :-
- A$Ce^{+4},\, Yb^{+2}$
- ✓$Gd^{+3},\, Nd^{+3}$
- C$La^{+3}, \,Lu^{+3}$
- D$Lr^{+3}, \,Lu^{+3}$
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(Atomic numbers $Ce =58, Gd =64$ and $Eu =63 .)$
$(a)$ $\left( NH _{4}\right)_{2}\left[ Ce \left( NO _{3}\right)_{6}\right]$
$(b)$ $Gd \left( NO _{3}\right)_{3}$ and
$(c)$ $Eu \left( NO _{3}\right)_{3}$
Answer is :