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Question

In which of the following pairs of solutions will the values of the van ’t Hoff factor be the same?


A
0.05MK4[Fe(CN)6] and 0.10MFeSO4
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B
0.15MK4[Fe(CN)6] and 0.05MFeSO4
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C
0.20M NaCl and 0.10MBaCl2
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D
0.05MFeSO4.(NH4)2SO4.6H2O and 0.02M KCl.MgCl2.6H2O
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Solution

The correct option is A 0.05MFeSO4.(NH4)2SO4.6H2O and 0.02M KCl.MgCl2.6H2O
As both are strong electrolytes, α=1 for them
K4[Fe(CN)6] 4K+ + [Fe(CN)6]4
n = 5
FeSO4(NH4)2SO4.6H2O Fe2+ + 2NH+4 + 2SO24
n = 5
As α=1 for both electrolytes and also n = 5 then van 't Hoff factor is the same for them.

Chemistry

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