MEDIUMMCQ SINGLEJEE Mains ChemistryPhysical ChemistryGaseous stateMaxwell's distribution of molecular speeds

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

A.H2< N2< O2<HBr

B.HBr< O2< N2< H2✓ Correct

C.H2< N2 = O2<HBr

D.HBr< O2< H2< N2

Explanation

Root Mean Square velocity is given by the following formula- r.m.s 3RT v M where, R=Universal Gas Constant T= Temperature M=Molar Mass From the formula, we can say that root mean square velocity is inversely proportional to the Molar mass. Therefore, higher the mass, lower will be the root mean square velocity. The Molar Mass of the following compound is 2 2 2 2 28 32 80.91 H N O HBr Thus, the correct option is (b) 2 2 2 HBr O N H

Back to Question Bank

Practice More Like This

Take chapter-wise tests, track your progress, and master Gaseous state.

Start Free Practice →