Which of the following elements forms a molecule consisting of eight of its own atoms?

Which of the following is a good conductor of heat and electricity?

The element $X$ on reaction with conc. $HNO_3$ forms two acidic oxides $A$ and $B$ of different shapes. Element $Z$ on reaction with conc. $H_2SO_4$ forms two acidic oxides $A$ and $D$ of different shapes. What are $X$ and $Z$?

The hybridisation of elements present in fullerene and graphite are respectively.

Which one of the following statements about the zeolites is false?

Which of the following compounds is the most volatile among $CH_4, SiH_4, GeH_4, SnH_4$?