MCQ
Which has minimum number of atoms of oxygen?
- A$10\, ml\, H_2O(l)$
- B$0.1\, mol$ of $V_2O_5(s)$
- C$12\, gm\, O_3(g)$
- ✓$12.04\times10^{22}$ molecules of $CO_2$
${=12.04 \times 10^{22} \times 2} $
${=24.08 \times 10^{22} \text { atoms of oxygen }}$
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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