Answer:
1Write down the unbalanced chemical equations.
(i) Ca + O2 ---> CaO
(ii) C2H6 + O2 ---> CO2 + H2O
(iii) Fe2O3 + CO ---> Fe + CO2
2Balance the equations by adjusting the coefficients of the compounds.
(i) 2Ca + O2 ---> 2CaO
(ii) 2C2H6 + 7O2 ---> 4CO2 + 6H2O
(iii) Fe2O3 + 3CO ---> 2Fe + 3C02
