find the odd one Neon, Helium ,water, argon
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Helium neon argon oxygen krypton find the odd one out. 2 ... prove that hydrogen on combustion in air forms water.
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Oxygen
Because, all other gases (Neon, Helium, Argon, Krypton, Xenon) are noble gases, and oxygen is not a noble gas.
A noble gas is a stable gas. Does not react with anything.
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