Which of the following graphs correctly represents the variation of molar heat capacity at constant volume with temperature for an ideal monoatomic gas?
A
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B
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C
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D
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Solution
The correct option is C For an ideal monoatomic gas, Degree of freedom (f)=3 ∴CV=f2R=3R2 CV is independent of temperature, hence graph of CVversusT will be a straight line parallel to T−axis.