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States of Matter and Gaseous StatemediumMCQ SINGLE

At STP, the order of the RMS speed of molecules of , , and gases is — States of Matter and Gaseous State Chemistry Question

Question

At STP, the order of the RMS speed of molecules of $\text{H}_2$, $\text{N}_2$, $\text{O}_2$ and $\text{HBr}$ gases is

Answer: A

💡 Solution & Explanation

Speed is inversely proportional to sqrt(Mass). Lightest is fastest. Therefore, correct answer is A.

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