MCQ
$[Cu(CN)_4]^{2-}$ is more stable than $[Cu(NH_3)_4]^{2+}$ because :-
- Astability constant of $[Cu(CN)_4]^{2-}$ is greater than $[Cu(NH_3)_4]^{2+}$
- B$CN^-$ is stronger ligand than $NH_3$
- ✓both $(A)\, \& \,(B)$
- Dnone
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$(I)$ It is easier to remove $2 \mathrm{p}$ electron than $2 \mathrm{s}$ electron
$(II)$ $2 \mathrm{p}$ electron of $\mathrm{B}$ is more shielded from the nucleus by the inner core of electrons than the $2 s$ electrons of $Be.$
$(III)\; 2 s$ electron has more penetration power than $2 \mathrm{p}$ electron.
$(IV)$ atomic radius of $\mathrm{B}$ is more than $\mathrm{Be}$
(Atomic number $\mathrm{B}=5, \mathrm{Be}=4$ )
The correct statements are