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Liquefaction of Gases and Critical Constants

At point A,...

Question

At point $A$ , which of the following is true?
$P :$ Compressibility factor becomes 0.375
$Q :$ Gas is called van der Waals gas
$R :$ Below $A$ only one variable is required for liquefaction

only

P, Q

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only

Q, R

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P, Q

and

R

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only

P, R

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Solution

The correct option is C $P, Q$ and $R$
"At $T_{c}, Z_{c} = \frac{P_{c} V_{c}}{R T_{c}}$ "
Below A only one variable is required for liquefaction and that is the temperature.

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∣ ∣ ∣ ∣ ∣ \begin{matrix} c o s (A - P) & c o s (A - Q) & c o s (A - R) c o s (B - P) & c o s (B - Q) & c o s (B - R) c o s (C - P) & c o s (C - Q) & c o s (C - R) \end{matrix} ∣ ∣ ∣ ∣ ∣

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⋆

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