Q11 of 34 Page 70

Phosphorus is kept in water. Why?

Phosphorus is a very reactive element. It catches fire spontaneously in air. But it is insoluble in water so it is kept in water.


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9

Bells used in temples are not made up of wood. Why?

 10

Write a word equation for heated iron and steam.

 12

What is the nature of oxides formed

(a) when metals combine with oxygen?


(b) when non-metals combine with oxygen?

 13

Give reason why copper cannot displace zinc from its salt solution.