Chemistry Transition Elements ETEA 2024
PMDC Verified Question 7 of 68
Potassium ferrocyanide is which type of salt?
A
Complex
B
Mixed
C
Double
D
Normal
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option A: Complex
Concept:

Salts can be categorized based on how they dissociate in water. Coordination compounds behave fundamentally differently than simple or double salts.

Solution:

  • The chemical formula for Potassium ferrocyanide is \(K_4[Fe(CN)_6]\).


  • When dissolved in water, it ionizes into \(4 K^+\) ions and one large \([Fe(CN)_6]^{4-}\) anion.


  • The \([Fe(CN)_6]^{4-}\) entity does NOT break down further into individual \(Fe^{2+}\) and \(CN^-\) ions. The coordinate covalent bonds hold it strictly together as a single complex ion.


  • Because it yields a complex ion in solution, it is classified as a Complex salt.


Why other options are incorrect:

  • Double Salt: (e.g., Mohr's salt) Completely dissociates into all its constituent simple ions in water.


  • Normal Salt: (e.g., NaCl) Formed by complete neutralization of acid and base.

Quality & Fidelity Assurance: Every question on BeambePrep is rigorously curated against the official PMDC syllabus with zero filler, zero out-of-syllabus content, and zero typos. When an authentic past paper originally contained a historical mistake or ambiguity from the examining board (such as UHS or NUMS), BeambePrep faithfully reflects the original paper while detailing the nuance and scientific consensus in the autopsy above.

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