Q75 / 180 · NEET 2015 (Phase 1) · Chemistry

Which one of the following electrolytes has the same value of van's Hoff's factor (i) as that of $A l_{2} {(S O_{4})}_{3}$ (if all are $100 %$ ionized)?

A
$K_{2} S O_{4}$
B
$K_{3} [F e {(C N)}_{6}]$
C
$A l {(N O_{3})}_{3}$
Correct answer
D
$K_{4} [F e {(C N)}_{6}]$

Solution

A l_{2} {(S O_{4})}_{3} \to 2 A l^{3 +} + 3 {S O}_{4}^{2 -} (i = 5)

K_{2} S O_{4} \to 2 K^{+} + {S O}_{4}^{2 -} (i = 3)

K_{3} [F e {(C N)}_{6}] \to 3 K^{+} + {[F e {(C N)}_{6}]}^{3 -} (i = 4)

Al {({NO}_{3})}_{3} \to {Al}^{3 +} + 3 {NO}_{3}^{-} (i = 4)

K_{4} [Fe {(CN)}_{6}] \to 4 K^{+} + {[Fe {(CN)}_{6}]}^{4 -} (i = 5)

Hence, the correct answer is option: 'D'.

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