Q3 of 56 Page 86

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:

Metal oxides have relatively high melting points. Here both iron and calcium are metals, but iron oxide is insoluble in water.

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1

Which of the following pairs will give displacement reactions?

 2

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

 4

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

 5

The electrical conductivity and melting point of an alloy is: