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Question:

Points I, II and III in the following plot respectively correspond to (Vmp: most probable velocity).

VmpofN2(300K);VmpofH2(300K);VmpofO2(400K)

VmpofH2(300K);VmpofN2(300K);VmpofO2(400K)

VmpofN2(300K);VmpofO2(400K);VmpofH2(300K)

VmpofO2(300K);VmpofN2(300K);VmpofH2(400K)

Solution:

Correct option is D.
VmpofN2(300K);VmpofO2(400K);VmpofH2(300K)
Vmp=√(2RT/M) ⇒Vmp ∝ √(T/M)
For N2, O2, H2:
300/28 < 400/32 < 300/2
VmpofN2(300K) < VmpofO2(400 K) < VmpofH2(300K).
Option D is correct.