MCQ
The total number of rare-earth elements is
- A$8$
- B$32$
- ✓$14$
- D$10$
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$kJ\,mol ^{-1}$ (Nearest integer)
Given : $\Delta_{ dis } H _{ Cl _{2(g)}}^{\circ}=240\,kJ\,mol ^{-1}$.
$\Delta_{ eg } H _{ Cl _{(g)}}^{\circ}=-350\,kJ\,mol ^{-1}$,
$\Delta_{ hyd } H _{ Cl i _{( j )}^{\circ}}^{\circ}=-380\,kJ\,mol ^{-1}$
(Atomic No. $Y = 39$, $La = 57$, $Eu = 63$, $Lu = 71$)