MCQ
Which allotrpic form of carbon does not have hexagonal rings in its structure
- ✓diamond
- Bgraphite
- Cfullerene
- DNone of the above

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Statement $I$ : Boron is extremely hard indicating its high lattice energy
Statement $II$ : Boron has highest melting and boiling point compared to its other group members.
In the light of the above statements, choose the most appropriate answer from the options given below
$ \mathrm{Sr}^{2+}(\mathrm{Z}=38), \mathrm{Cs}^{+}(\mathrm{Z}=55), \mathrm{La}^{2+}(\mathrm{Z}=57) \mathrm{Pb}^{2+} $
$ (\mathrm{Z}=82), \mathrm{Yb}^{2+}(\mathrm{Z}=70) \text { and } \mathrm{Fe}^{2+}(\mathrm{Z}=26)$