name two other elements apart from carbon ad hydrogen which are present in coal and petroleum. Write the chemical reaction when the combustion of these elements takes place on burning coal.

Explanation

The elements nitrogen and sulphur are also present in coal and petroleum. The products of combustion are listed.
`N_(2)(g)+O_(2)(g)to2NO(g),2NO(g)+O_(2)(g)to2NO_(2)(g)`
`S(g)+O_(2)(g)toSO_(2)(g),2SO_(2)(g)+O_(2)(g)to2SO_(3)(g)`