What is formed when boiling sulfur reacts with dihydrogen gas?

What is the number of electrons lost by a metal atom to form a positive ion called?

Account for the following:
$(a)$ Aluminium is more reactive than iron,but its corrosion is less than iron.
$(b)$ Hydrogen gas is not evolved when zinc metal reacts with dilute $HNO_3$.
$(c)$ Carbon is not used for reducing aluminium from aluminium oxide.

Which mixture of two gases,taken in equal proportions in a gas jar,reacts in the presence of sunlight?

Write chemical equations for the reactions taking place when:
$(i)$ Iron reacts with steam.
$(ii)$ Magnesium $(Mg)$ reacts with dilute $HCl$.
$(iii)$ Copper is heated in air.

Which one of the following properties is not generally exhibited by ionic compounds?