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Question

Identify the example of an element from the following options.

A
H2S
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B
O2
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C
CH4
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D
NH3
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Solution

The correct option is D O2
Elements are pure substances made up of only one kind of atoms. An oxygen molecule (O2) is the molecule of an element as it contains only oxygen atoms in it.

However, hydrogen sulphide (H2S), methane (CH4) and ammonia (NH3) are molecules of compound in which the different constituent elements are chemically combining with each in a definite ratio.

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