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Question

Choose the correct formula(s) regarding Van't hoff factor (i) :

A
i=Normal molar massAbnormal molar mass
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B
i=Abnormal molar massNormal molar mass
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C
i=No. of moles before association/dissociationNo. of moles after association/dissociation
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D
Both (b) and (c).
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Solution

The correct option is A i=Normal molar massAbnormal molar mass
Van't Hoff factor (i): It is a correction factor by which actual extent of association/ dissociation can be expressed.
For electrolytic solute undergoing association :
i<1
For electrolytic solute undergoing dissociation :
i>1
For non-electrolytic solute:
i=1

i=Experimental Colligative Property (observed)Calculated Colligative Property (expected)

i=No. of moles after association/dissociationNo. of moles before association/dissociation

i=Normal/Theoretical molar massAbnormal/Observed molar mass


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