On heating copper nitrate strongly,$.......$ is finally obtained.

Litharge $(PbO)$ is $NOT$ used in which of the following?

Which of the following statements are correct?
$i$. The basic structural unit of silicates is $SiO_4^{4-}$
$ii$. Silicones are biocompatible
$iii$. Producer gas contains $CO$ and $N_2$
The correct option is

The number of six-membered and five-membered rings in Buckminster fullerene respectively is

In the following reaction,assign the nature of the product of complete hydrolysis at $R.T.$ for the underlined atom:
$\underline{Si}H_4 + 4H_2O \longrightarrow H_4SiO_4 + 4H_2$

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