Correct statements among $(i)$ to $(iv)$ regarding silicones are:
$(i)$ they are polymers with hydrophobic character
$(ii)$ they are biocompatible
$(iii)$ in general,they have high thermal stability and low dielectric strength
$(iv)$ usually they are resistant to oxidation and used as greases.

Monosilane,on coming in contact with air,burns with a luminous flame producing vortex rings. These rings are of:

Carbon differs from other elements of the group. Which is the false statement?

$A$ tetravalent element forms monoxide and dioxide with oxygen. When air is passed over the heated element $(1273 \ K)$,producer gas is obtained. The monoxide of the element is a powerful reducing agent and reduces ferric oxide to iron. Identify the element and write the formulas of its monoxide and dioxide. Write chemical equations for the formation of producer gas and the reduction of ferric oxide with the monoxide.

Nitrogen gas is absorbed by which of the following substances at high temperature to form a cyanamide derivative?

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