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Solution


Q.

This element is very reactive to air and cannot be kept open in air. It reacts vigorously with water. Identify the element from the following.
1 Mg  
2 Na  
3 P  
4 Ca  

Ans.

(2)

Element A is sodium as it is soft and can be cut with knife. It is kept in kerosene because it reacts vigorously when comes in contact with water or air.