Which of the following elements would yield:

(i) an acidic oxide,

(ii) a basic oxide, and

(iii) a neutral oxide?

37 Name two metals which react violently with cold water. Write any three observations you would make when such a metal is dropped into water. How would you identify the gas evolved, if any, during the reaction? 38 With the help of examples, describe how metal oxides differ from non-metal oxides. 39 What are amphoteric oxides? Give two examples of amphoteric oxides. 39 Choose the acidic oxides, basic oxides and neutral oxides from the following:

Na₂O; CO₂; CO; SO₂; ; N₂O; H₂O.