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Question

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


A

Mg

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B

Na

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C

P

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D

Ca

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Solution

The correct option is B

Na


Explanation for correct option

(B)Na

  • Sodium is so soft that it can be cut with a knife.
  • It reacts vigorously with oxygen when kept open in the air and hence, we keep it immersed in kerosene oil.
  • It also reacts vigorously with water and air.

Explanation for incorrect option

An element A is a sodium. Hence, options (A),(C), and (D) are incorrect.

Hence, option (B) is correct. An element “sodium” is soft and can be cut with a knife.


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