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11 December, 20:33

Which is not an example of a lighter-than-air gas?

A. Argon

B. Hot air

C. Hydrogen

D. Helium

+2
Answers (2)
  1. 11 December, 23:38
    0
    Imma say the answer is A argon.
  2. 12 December, 00:07
    0
    I think the answer is A. Argon.
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