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Which one of the following electrolytes has the same value of van't Hoff factor (i) as that of K ₄ [ Fe ( CN )₆ ] ?

Options

  1. AAl ₂ ( SO ₄ )₃
  2. BK ₂ SO ₄
  3. CK ₃ [ Fe ( CN )₆ ]
  4. DAl ( NO ₃ )₃

Correct answer

A. Al ₂ ( SO ₄ )₃

Step-by-step solution

The value of van't Hoff factor of the given molecule is as follows : aligned Al ₂ ( SO ₄ )₃ & 2 Al ³⁺+3 SO ₄²⁻, i =5 ~K ₂ SO ₄ & 2 ~K ⁺+ SO ₄²⁻, i =3 ~K ₃ [ Fe ( CN )₆ ] & 3 ~K ⁺+ [ Fe ( CN )₆ ]³⁺, i =4 Al ( NO ₃ )₃ & Al ³⁺+3 NO ₃⁻, i =4 aligned The van't Hoff factor for K ₄ [ Fe ( CN )₆ ] is K ₄ [ Fe ( CN )₆ ] 4 ~K ⁺+ [ Fe ( CN )₆ ]⁴⁻, i =5 Al ₂ ( SO ₄ )₃ has the same value of van't Hoff factor as that of K ₄ [ Fe ( CN )₆ ] .

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