25% of a solute is dimerised in a solution. Van't Hoff factor of the solute in the solution is

Due to association, number of particles decreases…. i < 1….always ; Van't Hoff factor,  i=1-α+αn ; n=2…..dimerisation….i=1-α2; n=3…..trimerisation….i=1-2α3; n=4…..tetramerisation….i=1-3α4;α= Degree of association ;Ex ; For 5% associated solute,  α=5100= 0.05 ;0.1, 0.15, 0.2, 0.25, 0.3…..for 10%, 15%, 20%, 25%, 30% association ;α for x% associated solute = x100; a) i=1-0.052…5% dimerised ; b) i=1-0.12…10% dimerised ; c) i=1-0.152…15% dimerised ; d) i=1-0.22…20% dimerised ; e) i=1-0.252…25% dimerised……