$A$ thin film of aluminum deposited on glass acts as a good mirror because ...............

Lead is soluble in:

Which one of the following is a correct set?

Which of the following does $NOT$ give oxygen upon heating?

Choose the correct statements about allotropes of carbon:
$I$. Graphite has a layered structure.
$II$. Buckminsterfullerene is not aromatic in nature.
$III$. The distance between two adjacent layers in graphite is $340 \ pm$.
$IV$. The hybridization of carbons in graphite and Buckminsterfullerene is the same $(sp^2)$.

Assertion $(A)$: Silicones are used for water proofing of fabrics.
Reason $(R)$: The repeating unit in silicones is $R_2SiO$.