A dilute solution contains 'x' moles of solute A in 1 kg of solvent with molal elevation constant `K_(b)`. The solute dimerises in the solution according to the following equation. The degree of association is (a) : `2A hArrA_(2)` The van't Hoff factor will be:
A
I = 1 -2a
B
I = 1 `-a/2`
C
I = 1 `+a/2`
D
I = 1 + a
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b
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