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For the reaction N2O4(9) 2NO21), if degrees of dissociation of N20, are 25%, 50% 75% and 100%, the gradation of observed vapour densities is

For the reaction N2O4(9) 2NO21), if degrees of dissociation of N20, are 25%, 50% 75% and 100%, the gradation of observed vapour densities is : (A) di > d2 > da > d4 (B) d4 > d3 > d2 > di (C) di = dz = d3 = d4 (D) None

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