TS EAMCET · Chemistry · Surface Chemistry

For precipitating \(\mathrm{Fe}(\mathrm{OH})_3\) sol, the best precipitating agent is

A \(\mathrm{Na}_2 \mathrm{SO}_4\)
B \(\mathrm{Cr}(\mathrm{OH})_3\)
C \(\mathrm{Al}(\mathrm{OH})_3\)
D \(\mathrm{Na}_3\left[\mathrm{Fe}(\mathrm{CN})_6\right]\)

Verified Solution

Answer & Solution

Correct Answer

(D) \(\mathrm{Na}_3\left[\mathrm{Fe}(\mathrm{CN})_6\right]\)

Step-by-step Solution

Detailed explanation

\(\mathrm{Fe}(\mathrm{OH})_3\) is a positive sol, hence the best coagulant for precipitation of \(\mathrm{Fe}(\mathrm{OH})_3\) is \(\mathrm{Na}_3\left[\mathrm{Fe}(\mathrm{CN})_6\right]\). The precipitating effect of an ion on dispersed phase of opposite charge increases with the…

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

Same subject

Observe the following complex ions

\(\left[\mathrm{Mn}(\mathrm{CN})_6\right]^{3-}\)	\(\left[\mathrm{Fe}(\mathrm{CN})_6\right]^{3-}\)	\(\left[\mathrm{CoF}_6\right]^{3-}\)	\(\left[\mathrm{Co}\left(\mathrm{C}_2 \mathrm{O}_4\right)_3\right]^{3-}\)
A	B	C	D

Identify the option in which the unpaired electrons in the complex ions are in correct increasing order

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