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 (b) Na (c) P (d) Ca

Answer: (b) Na

Sodium is an alkali metal and is so soft that it can be easily cut by knife.

  • Soft metals are those which can be cut and easy to dent, work, or cut without shattering, malleable.
  • Sodium metal is soft enough to be cut with a knife.

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