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Solution


Q.

The elements or compounds which occur naturally in the earth crust are known as:
1 Ores  
2 Minerals  
3 Gangue  
4 None of these  

Ans.

(2)

The elements or compounds which occur naturally in the earth crust are known as minerals. The mineral from which an element can be extracted easily and profitably is called an ore. The impurities or unwanted substances present in ore such as sand, rock etc. is known as gangue.