On strongly heating $Pb(NO_3)_2$ crystals,the gas formed is

$(CH_3)_3SiCl$ is used during the polymerization of organosilicons because

Assertion : $Pb^{4+}$ compounds are stronger oxidizing agents than $Sn^{4+}$ compounds.
Reason : The higher oxidation states for the group $14$ elements are more stable for the heavier members of the group due to 'inert pair effect'.

Mention the starting material to produce silicones.

Which of the following compounds is used in cosmetic surgery?

Silicon is an important component of which of the following?