20. Which is the lightest gas. / सबसे हल्की गैस कौन सी है।
O
H
N
CO2
Answer / उत्तर :- H
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20. Which is the lightest gas. / सबसे हल्की गैस कौन सी है।
O
H
N
CO2
Answer / उत्तर :- H
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