What chemical process is used for obtaining a metal from its oxide?

81 Give the formulae of the chlorides of the elements X and Y having atomic numbers of 3 and 6 respectively.

Will the properties of two chlorides be similar or different? Explain your answer.

1 A zinc ore gave CO₂ on treatment with a dilute acid. Identify the ore and write its chemical formula. 3 State two ways to prevent the rusting of iron. 4 What is meant by galvanization ? Why is it done?