Which among the following is most likely to react when kept in open air?

Copper

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Potassium

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Gold

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Zinc

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Solution

The correct option is B Potassium
Potassium and sodium are alkali metals and react vigorously with oxygen even in room temperatures. Zinc reacts with oxygen and forms protective layer of oxides on the outside.Copper doesnt burn in oxygen, but forms a black layer on the outside. Gold doesnt react even in high temperatures.

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Q. 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:
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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:

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(b) potassium

(d) aluminium

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