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An element A is soft and can be cut with a knife. This is very reactive to air and cannot be kept open in air. It reacts vigorously with water. Identify the element from the following. 
A. Mg
B. Na
C. P
D. Ca

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Correct Answer - b
 From the properties of the element described In the question, it can be said surely that the element IS sodium (Na). 

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