Which of the following is kept in water?

$A$ $1 \ L$ flask is full of brown bromine vapour. The intensity of the brown colour of the vapour will not decrease appreciably on adding which of the following to the flask?

Which of the following units is used to form cross-linked silicone?

In the carbon family,elements other than carbon do not form $p\pi-p\pi$ bonds because their atomic radii are very ........

Which of the following oxides is amphoteric in nature?

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