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At equilibrium the concentration of H2,I2 and HI in a reaction chamber kept at 773 K is H2= 0.42 mole liter-1,I2 = 0.042 mole liter-1;HI = 3.52 moles liter-1. The value of the equilibrium constant for the reaction H2+I22HI is

A. 0.712

B. 0.75

C. 71.5

D. 31.5

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