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Solution


Q.

Read the passage carefully and answer the following questions from (i) to (v):

All metals do not react with oxygen at the same rate. Different metals show different reactivities towards oxygen. Almost all metals combine with oxygen to form metal oxides. Metal oxides are basic in nature but some metal oxides, such as aluminium oxide, zinc oxide, etc. show both acidic as well as basic behaviour. Most metal oxides are insoluble in water but some like Sodium oxide and Potassium oxide dissolve in water to produce alkalis.

 

(ii) Why does the magnesium ribbon need to be cleaned before burning it in air
1 To increase its efficiency  
2 To remove the oxide layer from it  
3 To decrease its efficiency  
4 All of the above  

Ans.

(2)