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Home » 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
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
CBSE | Chemistry | Class 10 | Exercise 1 | Metals and Non Metals | NCERT | Science
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

Reason: Sodium is an element that is soft and can be cut with a knife, reactive to air and cannot be kept open in the air and also reacts vigorously with water.

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