The acidic oxide from the following is

Anhydrous sample of ferric chloride is prepared by heating:

Reaction of an inorganic sulphite $X$ with dilute $H_{2}SO_{4}$ generates compound $Y$. Reaction of $Y$ with $NaOH$ gives $X$. Further,the reaction of $X$ with $Y$ and water affords compound $Z$. $Y$ and $Z$,respectively,are:

The hydride of phosphorus,$PH_3$,is ...

Davy and Faraday proved that

What are silicones?