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Question

Consider the following graph and identify how many statements are correct for real gas

(i) At point A,Z approaches one and gas shows ideal behavior
(ii) For curve AB,Z<1, force of attraction increases on increasing pressure
(iii) At point B, value of compressibility factor is minimum
(iv) For the curve BC,Z<1, force of repulsion increases on increasing pressure
(v) At point C,Z=1, force of attraction are not equal to force of repulsions
(vi) At the curve CD,Z>1, gas is more difficult to compress

A
5.00
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B
5.0
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C
5
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Solution

The gas compressibility factor (Z) tells us how much the real gas deviates from the ideal gas at a given pressure and temperature.
Z=PVactualRT, For 1 mol of gas
At point C,
Z=1, but gas is not ideal in nature, force of attraction are equal to force of repulsion.

As the pressure increases at a given temperature, initially attractive for increases between the molecules and hence the value of Z decreases but with further increase in pressure repulsive force dominates and Vactual increases gradually and corrspondingly value of Z also increases.

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