An element is soft can be cut easily with a knife.It is very reactive and cannot be kept open in the air.It reacts vigorously with water.This element is most likely to be:

(a) magnesium

(b) potassium

(c) phosphorous

(d) aluminium

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Solution

(b) potassium

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An element is soft can be cut easily with a knife.It is very reactive and cannot be kept open in the air.It reacts vigorously with water.This element is most likely to be: (a) magnesium (b) potassium (c) phosphorous (d) aluminium

(b) potassium

An element is soft can be cut easily with a knife.It is very reactive and cannot be kept open in the air.It reacts vigorously with water.This element is most likely to be:

(a) magnesium

(b) potassium

(c) phosphorous

(d) aluminium