$C_{60}$,an allotrope of carbon,contains:
- A$20$ hexagons and $12$ pentagons.
- B$12$ hexagons and $20$ pentagons.
- C$18$ hexagons and $14$ pentagons.
- D$16$ hexagons and $16$ pentagons.
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$2$. Lead $(IV)$ chloride is highly unstable towards heat.
$3$. Lead is known not to form an iodide,$PbI_4$.
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