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

Bleaching powder loses its power on keeping for a long time because

Mention the starting material to produce silicones.

Identify $(P)$ and $(Q)$ in the following reaction:
$2 CH_3 Cl + Si$ $\xrightarrow[570 \ K]{\text{Cu powder}} (P)$ $\xrightarrow{H_2 O} (Q)$ $\longrightarrow \text{Straight chain polymer}$

Identify the correct statements from the following.
$i$. Melting points and boiling points of group $13$ elements are much higher than those of corresponding group $14$ elements.
$ii$. $SiO$ only exists at high temperatures.
$iii$. $PbI_4$ does not exist.
$iv$. Buckminster fullerene contains twelve $6$-membered carbon rings and twenty $5$-membered carbon rings.

Which of the following compounds is formed when chlorine gas reacts with dry slaked lime $Ca(OH)_2$?