Which of the following ions will have minimum coagulating value for the sol obtained by adding `FeC_3` solution to slight excess of NaOH?

Options

A. `SO_4^(2-)`
B. `[Fe_6^(3) `
C. `Ba^(+)`
D. `AI^(3+)`

Explanation

To solve the question regarding which ion will have the minimum coagulating value for the sol obtained by adding FeCl3 solution to a slight excess of NaOH, we can follow these steps:

### Step 1: Understand the Reaction
When FeCl3 is added to NaOH, a reaction occurs that leads to the formation of iron(III) hydroxide, Fe(OH)3, and sodium chloride, NaCl. The balanced equation for the reaction is:
\[ \text{FeCl}_3 + 3 \text{NaOH} \rightarrow \text{Fe(OH)}_3 + 3 \text{NaCl} \]

### Step 2: Identify the Charge of the Sol
In this reaction, Fe(OH)3 is formed, and since we are adding an excess of NaOH, the hydroxide ions (OH-) will be in excess. The resulting sol will be negatively charged due to the presence of excess OH- ions.
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