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A sugar exist in two isomeric form alpha...

A sugar exist in two isomeric form `alpha-D` & `beta-D` with specific rotation of `110^(@)` and `30^(@)` respectively. When `alpha-D` form of the suar is dissolved in water exhibits mutarotation till the equilibrium value of `90^(@)` is attained. The equilibrium constant of mutarotation of `beta-D` form [Assuming only `alpha` and `beta` form in solution] is equal to:

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