BITSAT2013ChemistryStates of MatterActual

Increasing order of rms velocities of H ₂, O ₂, ~N ₂ and HBr is

Options

AH ₂> O ₂> N ₂> HBr
BHBr < O ₂< N ₂< H ₂
CH ₂> N ₂ HBr
DHBr > N ₂< O ₂< H ₂

Correct answer

B. HBr < O ₂< N ₂< H ₂

Step-by-step solution

RMS velocity of molecules depends on mass. If mol. wt. increases, rms velocity of melocules decreases. rms 1 m wt The order of increasing m . wt . is H ₂< N ₂< O ₂< HBr Order of V_ mx of molecules. HBr < O ₂< N ₂< H ₂

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