Identify the correct statements from the following (i) The atomic radius of $\mathrm{Al}$ is lower than the…
Identify the correct statements from the following
(i) The atomic radius of $\mathrm{Al}$ is lower than the atomic radius of $\mathrm{Ga}$.
(ii) Boron exists in many allotropic forms.
(iii) The melting point of $\mathrm{Ga}$ is lowest among the group 13 elements.
i, ii, iii
ii, iii
i, ii
i, iii
Solution
Boron exists in many allotropic forms.
(i) $\alpha$-rhombohedral
(ii) $\beta$-rhombohedral
(iii) $\beta$-tetragonal
in many specific condition it will exists in $\alpha$ and $\beta$-tetragonal forms.
The melting point of $\mathrm{Ga}$ is lowest in group 13. When we go down to group melting point will increase.