Write the balanced chemical equations for the following reactions :
(i) `"Hydrogen + Chlorine " to " Hydrogen chloride"`
(ii) `"Magnesium oxide + Carbon " to " Magnesium + Carbon monoxide"`
(iii) `"Phosphorus pentachloride + Water " to " Phosphoric acid + Hydrogen chloride"`
(iv) `"Sulphur dioxide + Oxygen " to " Sulphur trioxide"`
(v) `"Sodium + Water " to " Sodium hydroxide + Hydrogen"`.