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

1. Mg
2. Na
3. P
4. Ca

Correct Answer: (b) Na

Explanation: Sodium (Na) is an alkali metal. It is soft and can be cut with a knife. It is very reactive to air and cannot be kept open in the air. It reacts vigorously with water.

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Updated on: 10-Oct-2022

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