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An element is soft and can be cut with a knife. It is very reactive and cannot be kept open in the air. It reacts vigorously with water. The element is most likely to be:
An element is soft and can be cut with a knife. It is very reactive and cannot be kept open in the air. It reacts vigorously with water. The element is most likely to be:
CBSE | Chemistry | Class 10 | Exercise 1 | Lakhmir Singh | Metals and Non Metals
An element is soft and can be cut with a knife. It is very reactive and cannot be kept open in the air. It reacts vigorously with water. The element is most likely to be:

(a) Mg

(b) S

(c) P

(d) Na

Solution:

Option (d) is the answer. Sodium is so soft that a knife can be used to cut it. When left open in the air, it reacts violently with oxygen, thus we keep it submerged in kerosene oil. It also has a strong reaction with water.

i

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