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A certain gas 'A' polymerizes to a very small extent at a given temperature as \( n \mathrm{~A}(\mathrm{~g}) \rightleftharpoons \mathrm{A}_{\mathrm{n}}(\mathrm{g}) \). The reaction is started with one mole of ' \( \mathrm{A} \) ' in a container of capacity \( V \). Which of the following is the correct value of \( \frac{P V}{R T} \), at equilibrium?
(a) \( 1-\frac{(n-1) \cdot K_{C}}{V^{n-1}} \)
(b) \( \frac{(n-1) \cdot K_{C}}{V^{n-1}} \)
(c) \( 1-\frac{n \cdot K_{C}}{V^{n-1}} \)
(d) \( 1-\frac{n \cdot K_{C}}{V^{n}} \)
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