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The equilibrium constant for the equilib...

The equilibrium constant for the equilibrium `PCl_(5)(g) hArr PCl_(3)(g) + Cl_(2)(g)` at a particular temperature is `2 xx 10^(-2)" mol dm"^(-3)`. The number of moles of `PCI_(5)` that must be taken in a one-litre flask at the same temperature to obtain a concentration of 0.20 mol of chlorine at equilibrium is

A

`2.0`

B

2.2

C

1.8

D

0.2

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