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"`.

Explanation

`(i) " "H_(2) + Cl_(2) to 2HCl`
`(ii)" "MgO + C to Mg + CO`
`(iii)" "PCl_(5) + 4H_(2)O to H_(3)PO_(4) + 5HCl`
`(iv)" "2SO_(2) + O_(2) to 2SO_(3)`
`(v)" "2Na + 2H_(2)O to 2NaOH + H_(2)`