Q10 of 31 Page 56

State two ways to prevent the rusting of iron.

(i) Rusting of iron can be prevented by galvanization. In this process, iron articles are coated with a thin layer of zinc metal which prevent the iron to come in contact with air and moisture. Hence, rusting is prevented.

(ii) Rusting of iron can be prevented by applying oil, grease, or paint. These are applied all over the surface of iron object to keep the air and moisture away.


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8

In the electrolytic refining of a metal M, what would you take as the anode, the cathode, and the electrolyte?

 9

Pratyush took sulphur powder on a spatula and heated it. He collected the gas evolved by inverting a test tube over it as shown in the figure here.

(a) What will be the action of gas on:


(i) dry litmus paper ?


(ii) moist litmus paper?


(b) Write a balanced chemical equation for the reaction taking place.


 11

What type of oxides are formed when non-metals combine with oxygen?

 12

Give reasons:

(a) Platinum, gold and silver are used to make jewellery


(b) Sodium, potassium and lithium are stored under oil.


(c) Aluminium is a highly reactive metal, yet it is used to make utensils for cooking.


(d) Carbonate and sulphide ores are usually converted into oxides during the process of extraction.