`COCl_(2)` gas dissociates according to the equation, `COCl_(2)hArrCO(g)+Cl_(2)(g)`. When heated to 700 K the density of the gas mixture at 1.16 atm and at equilibrium is `1.16 g//litre` The degree of dissociation of `COCl_(2)` at 700K is :
A
`0.28`
B
`0.50`
C
`0.72`
D
`0.42`
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c
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