Anhydrous calcium chloride $(CaCl_2)$ is which type of compound?

What are metallic or interstitial hydrides? How do they differ from molecular hydrides?

Hydrogen can be obtained from water,by the action of water on

Dihydrogen reacts with $CuO$ to give:

Identify the correct statements from the following:
$i$. Reaction of hydrogen with fluorine occurs even in dark.
$ii$. Manufacture of ammonia by Haber process is an endothermic reaction.
$iii$. $HF$ is an electron-rich hydride.

Which physical property of dihydrogen $(H_2)$ is wrong?