Anhydrous sample of ferric chloride is prepared by heating:

Bleaching powder is obtained by the interaction of chlorine and

$Me_3SiCl$ is used during the polymerisation of organosilicones because:

Assertion $(A)$: Graphite is used as a dry lubricant in machines which run at high temperatures.
Reason $(R)$: The layers of graphite slip one over the other when pressure is applied.
The correct option among the following is:

$A$ solid element $Y$ conducts electricity and forms two types of chlorides: $YCl_n$ (a colorless volatile liquid) and $YCl_{n-2}$ (a colorless solid). To which group does element $Y$ belong?

Graphite is used as a dry lubricant because of its