$Si_3O_9^{-6}$ (having three tetrahedral units) is represented as:

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

Which of the following is not a monomer for a high molecular mass silicone polymer?

Which of the following does not exist?

Identify the correct statements from the following.
$(i)$ Quartz is a piezoelectric material.
$(ii)$ All group $14$ tetrachlorides except $CCl_4$ are easily hydrolyzed in water.
$(iii)$ The $C-C$ bond distance within the layer of graphite is $154 \ pm$.
$(iv)$ $SiO_2$ is soluble in aqueous $HCl$ solution.

Which of the allotropic forms of carbon is aromatic in nature?