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An element A is soft and can be cut with...

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

Text Solution

Verified by Experts

The correct Answer is:
B
Sodium is so soft that can be cut using a knife. It reacts with oxygen or moisture present in air readily and reacts with water vigorously. Because of this sodium is stored in kerosene oil to prevent any reaction or accident due to reaction.
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OSWAL PUBLICATION-METALS AND NON-METALS-NCERT Exemplar (Multiple Choice Questions)
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