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

AcademicChemistryNCERTClass 10

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.

raja
Updated on 10-Oct-2022 13:27:24

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