Q7 of 400 Page 191

Why do we apply paint on iron articles?

we apply paint on iron articles in order to prevent it from rusting which occurs when iron is exposed to air for a duration of time. But the layer of paint prevent iron to come in contact with air and moisture.

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5 Name the metal which is used for galvanising iron. 6 Explain why, iron sheets are coated with zinc. 8 Give reason for the following:

Carbonate and sulphide ores are usually converted into oxides during the process of extraction of metals.

 9 Name a reducing agent that may be used to obtain manganese from manganese dioxide.