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Chemistry Question on Solutions

Which one of the following electrolytes has the same value of van't Hoff's factor (i) as that of Al2(SO4)3 {Al_2(SO_4)_3} (if all are 100% ionised) ?

A

Al2(SO4)3{Al_2(SO_4)_3}

B

K4[Fe(CN)6]{K_4[Fe(CN)_6] }

C

K2SO4{ K_2SO_4}

D

K3[Fe(CN)6]{K_3[Fe(CN)_6] }

Answer

K4[Fe(CN)6]{K_4[Fe(CN)_6] }

Explanation

Solution

van't Hoff factor of Al2(SO4)3−>2Al+3+3SO4−2 {Al_2 (SO_4)_3 -> 2Al^{+3} + 3SO^{-2}_4} so n = 5 K4[Fe(CN)6]−>4K++[Fe(CN)6]−4 {K_4 [Fe(CN)_6] -> 4K^{+} + [Fe(CN)_6]^{-4}} so n =5 ⇒\Rightarrow i = n =5