An element is soft and can be cut easily with a knife. It is very reactive and cannot be kept open in the air. It reacts vigorously with water too. This element is most likely to be:
(a) Magnesium
(b) Potassium
(c) Phosphorous
(d) Aluminium
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An element Mg (Magnesium) is soft and can be cut with a knife. Because this is very reactive to air and cannot be kept open in air. It reacts vigorously with water
Explanation:
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