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Bodenstein carried out the determination of equilibrium constant of phosgene equilibrium by introducing CO and $$Cl_2$$ at known pressure in a reaction bulb and measuring the equilibrium pressure from the attached monometer. In one experiment,CO at 342 mm and $$Cl_3$$ at 351.4 mm were introduced.The equilibrium pressure was found to be 439.5 mm. At equilibrium if partial pressure of $$COCl_2$$ be 'x' mm at $$127^0C$$.
Reaction is : $$CO+Cl_2 \rightleftharpoons COCl_2$$
The volume of reacting vessel is decreased by 3 times , $$k_p$$ changes by

A
3 times increased
B
Remains constant
C
1/3 times decreased
D
1/9 times increased
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Correct option is A. 3 times increased

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In phosgene gas reaction at 400 deg C, the initial pressures are pco =342 mm and pcl2 =352 mm and the total pressure at equilibrium is 440 mm.
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