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# I need help with Which one of the following electrolytes has the same value of van't Hoff's factor (i) as that of Al2(SO4)3(if all are 100% ionised) ?

Which one of the following electrolytes has the same value of van't Hoff's factor (i) as that of Al2(SO4)(if all are 100% ionised) ?

• Option 1)

Al(NO3)3

• Option 2)

K4[Fe(CN)6]

• Option 3)

K2SO4

• Option 4)

K3[Fe(CN)6]

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As we learned in concept:

Vant Hoff factor for dissociation -

Where

is the no. of dissociated particles

degree of association

- wherein

Let's check Van't Haff factor for each option.

Al(No3)3 -> Al3+ + 3(No3)-, i = 4

K4[ Fe (CN)6] -> 4K+ + [ Fe (CN)6]4-, i = 5

K2So4 -> 2K+ + So42-, i=3

K4[Fe (CN)6] -> 3K+ + [Fe (CN)6]3-, i = 4

Al2(So4)3 -> 2Al3+ + 3 So42-, i = 5

Option 1)

Al(NO3)3

this is the incorrect option

Option 2)

K4[Fe(CN)6]

this is the correct option

Option 3)

K2SO4

this is the incorrect option

Option 4)

K3[Fe(CN)6]

this is the incorrect option

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