If α is the degree of dissociation of Na2SO4, the van't Hoff factor (i) used for calculating the molecular mass is

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1+α

1+2α

1−α

1−2α

answer is B.

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Detailed Solution

Na2SO4⇌2Na++SO42−Mol. before diss.100Mol. after diss1−α2α1αi=Experiemental. C.P.Normal C.P.=1−α+2α+α=1+2α

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