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     EduGorilla 
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    The root mean square speeds at STP for the gases H2, N2, O2 and HBr are in the order

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    1. H2 < N2 < O2 < HBr
    2. HBr < O2 < N2 < H2
    3. H2 < N2 = O2 < HBr
    4. HBr < O2 < H2 < N2
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