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Nitrogen gas is lighter than Oxygen. Nitrogen gas is lighter than...

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Question:
Nitrogen gas is lighter than Oxygen. Nitrogen gas is lighter than Helium .Therefore,which appeals is the heaviest of the three gases.

Option A):
None of those
Option B):
False
Option C):
Can’t say
Option D):
True
Option E):
Probably true

Correct Answer is Option D):
True

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