MCQ
$B$ has a smaller first ionization enthalpy than $Be$. Consider the following statements :
$(I)$ 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
- ✓$(I), (II)$ and $(III)$
- B$(II), (III)$ and $(IV)$
- C$(I), (III)$ and $(IV)$
- D$(I), (II)$ and $(IV)$
