MCQ
$8\,g \,O_2$ has same number of atoms as that in
- A$14g\, CO$
- ✓$7g \,CO$
- C$11g\, CO_2$
- D$22g\, CO_2$
in $8\, \mathrm{g}\, \mathrm{O}_{2}$ No. of atom
$\frac{8}{16}=\frac{N}{N_{A}} \Rightarrow N=\frac{N_{A}}{2}$
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$(A)$ Kinetic energy of electron is $\propto \frac{ Z ^{2}}{ n ^{2}}$.
$(B)$ The product of velocity (v) of electron and principal quantum number (n), 'vn' $\propto Z ^{2}$.
$(C)$ Frequency of revolution of electron in an orbit is $\propto \frac{ Z ^{3}}{ n ^{3}}$.
$(D)$ Coulombic force of attraction on the electron is $\propto \frac{ Z ^{3}}{ n ^{4}}$.
Choose the most appropriate answer from the options given below :