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Question

Which of the following lists contains ONLY heavy elements

A
Oxygen, Carbon, Iron
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B
Helium, Oxygen, Carbon
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C
Hydrogen, Helium, Carbon
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D
Iron, Hydrogen, Oxygen
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Solution

The correct option is A Oxygen, Carbon, Iron
Helium and hydrogen being lighter gases are seen in other options other than option a. Thus , such options are incorrect options

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