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  • An element A is soft and can be cut with a knife. This is very reactive to air and cannot be kept open in air. It reacts vigorously with water. Identify the element from the following (a) Mg (b Na (c)P (d) Ca

An element A is soft and can be cut with a knife. This is very reactive to air and cannot be kept open in air. It reacts vigorously with water. Identify the element from the following
(a) Mg
(b) Na
(c) P
(d) Ca

Answers (1)

Ans. (b)
Given that A is soft and can be cut with a knife. This is very reactive to air and cannot be kept open in air. It reacts vigorously with water.
From the properties of the element described in the question, it can be said surely that the element is sodium (Na).

Therefore option (b) is correct

Posted by

infoexpert27

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