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Question

Which of the following is a chemical property of hydrogen?

A
It is a liquid at room temperature.
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B
It is less dense than air.
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C
It is odorless.
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D
It is colorless.
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E
It combusts in the presence of oxygen.
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Solution

The correct option is E It combusts in the presence of oxygen.
The chemical property of hydrogen is :

It combusts in the presence of oxygen to form water. During combustion, the composition and structure of hydrogen changes.
In a physical change, the composition of a substance remains the same. In a chemical change, the composition and the structure of the substance is changed.

A physical change is temporary while a chemical change is permanent.

Hence the correct option is E.

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