Which of the following statements is incorrect based on the graph?
X, Y, Z can be different gases or the same gas at different temperatures.
A
X = He, Y = Ne, Z = Ar at 323 K
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B
He is plotted at X = 1000 K, Y = 500 K, Z = 100 K
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C
X, Y, Z have RMS speeds marked
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D
Tc of gases is X>Y>Z
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Solution
The correct option is C
X, Y, Z have RMS speeds marked
a) At any given temperature T, molecular speed ∝√1M
Mass of the gases follows the order: Ar>Ne>He
So the right inswer can be X = Ar, Y = Ne, Z = He at 323 K.
b) For a given gas, molecular speed ∝√T
As T↑es,c↑es
Correct order should be: X>Y>Z
c) Most probable speeds are marked on the graph.
Let say 1, 2 and 3 are maxima of the graph X, Y and Z respectively. For that slop is zero, i.e. d(f(c))dc=0
That is not rms.
d) As mass increases, intermolecular forced increases hence Tc increases.