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

The common basic structural unit in silicates and silica is

What is/are true about $CO_2$ and $SO_2$?

The $INCORRECT$ statement regarding the structure of $C_{60}$ is :

$(a)$ Classify the following oxides as neutral,acidic,basic,or amphoteric:
$CO, B_2O_3, SiO_2, CO_2, Al_2O_3, PbO_2, Tl_2O_3$
$(b)$ Write suitable chemical equations to show their nature.

Helium mixed with oxygen is used in the treatment of