Solution

(a) Phosphorous is very reactive non metal.

Phosphorus is a solid. A highly reactive, poisonous, non-metallic element occurring naturally in phosphates, especially apatite, and existing in three allotropic forms, white (or sometimes yellow), red and black.

(b) Metals are good conductors of heat and electricity.

Atoms of metals readily lose their outer shell electrons, resulting in a free flowing cloud of electrons within their otherwise solid arrangement. This provides the ability of metallic substances to easily transmit heat and electricity.

(c) Iron is more reactive than copper.

Iron is high on reactivity series as compared to copper so it is more reactive than copper.

(d) Metals react with acids to produce hydrogen gas.

The products of acid/metal reactions are a salt and hydrogen gas. Some metals are so unreactive that they do not react with dilute acids at all, e.g. copper, silver and gold.