Answer the question on the basis of passage given below:

Adsorption is a surface phenomenon which can be expressed by means of an emprical relationship known as Freundlich Adsorption isotherm. The relationship is given by

\(\frac{x}{m} = KP^{\frac{1}{n}}\left(n > 1\right)\)

\(x = \)Mass of the gas adsorbed

\(m = \)Mass of adsorbent

\(P = \)Pressure at which adsorption takes place

\(K\) and \(n\) are constant

Which electrolyte electrolytes can coagulate a ferric hydroxide sol most effectively?

A. \(K_3[Fe(CN)_6]\)

B. \(Na_3PO_4\)

C. \(Na_2SO_4\)

D. \(KNO_2\)

E. \(KI\)

Choose the correct answer from the options given below:

A and B only

The correct answer is option 2. A and B only.

Let us look at why option 2 is the correct choices for coagulating ferric hydroxide sol:

\(K_3[Fe(CN)_6]\) (Potassium ferricyanide): This compound contains the ferricyanide ion (\(Fe(CN)_6^{3-}\)) and potassium ions (\(K^+\)). The ferricyanide ion has the ability to react with ferric ions (\(Fe^{3+}\)) present in the ferric hydroxide sol. The reaction between ferricyanide ions and ferric ions leads to the formation of insoluble ferric ferricyanide precipitate, which coagulates the sol.

\(Na_3PO_4\) (Sodium phosphate):

Sodium phosphate dissociates in water to form phosphate ions (\(PO_4^{3-}\)) and sodium ions (\(Na^+\)). The phosphate ions have the ability to form insoluble complexes with ferric ions (\(Fe^{3+}\)) present in the ferric hydroxide sol. This complex formation results in the precipitation of ferric phosphate, which coagulates the sol.

Why the other options are incorrect:

\(Na_2SO_4\) (Sodium sulfate): Sodium sulfate does not have specific ions that can effectively coagulate ferric hydroxide sol. While it can cause some precipitation reactions, it is not as effective as the ferricyanide ion or phosphate ion.

\(KNO_2\) (Potassium nitrite): Potassium nitrite does not contain ions that can effectively coagulate ferric hydroxide sol. It is not known for its coagulating properties in this context.

\(KI\) (Potassium iodide): Potassium iodide does not contain ions that can effectively coagulate ferric hydroxide sol. It does not form insoluble complexes with ferric ions that lead to precipitation and coagulation.

Therefore, option 2. A and B are the correct choices for electrolytes that can most effectively coagulate ferric hydroxide sol.