Q2 of 56 Page 86

Which of the following methods is suitable for preventing an iron frying pan from rusting?

Strictly speaking, all the above-mentioned methods would prevent iron from rusting. Since it is a frying pan, the most suitable method would be to apply a coating of zinc.

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26

(a) Make a flowchart to explain the various steps involved in the extraction of metals from ores.

(b) Give four characteristics of ionic compounds.


OR


Give reasons only:


(a) Na, K and Li are stored under oil.


(b) Pt, Au and Ag are used to make jewellery.


(c) Hydrogen gas is not evolved when metals react with nitric acid.


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


(e) Aqueous copper sulphate solution should not be stored in an iron container.

 1

Which of the following pairs will give displacement reactions?

 3

An element reacts with oxygen to give a compound with a high melting point. This compound is also soluble in water. The element is likely to be:

 4

Food cans are coated with tin and not with zinc because: