Exams › JEE Advanced › Chemistry

Which of the following cations is NOT precipitated by the reagent combination NH4Cl + NH4OH?

1. Al³+
2. Cr³+
3. Fe²+
4. Fe³+

Correct answer: Fe²+

Solution

In qualitative analysis (Group III A), NH4Cl suppresses OH⁻ concentration. Al(OH)3, Cr(OH)3, and Fe(OH)3 (very low Ksp) precipitate. Fe(OH)2 (higher Ksp) does not precipitate here; Fe²+ is detected later as FeS in Group III B.

Related JEE Advanced Chemistry questions

• The count of d-electrons in Fe2+ differs from the number of:
• Which sequence of reactions accurately depicts the chemical processes involving iron and its associated compounds?
• When H2S interacts with an acidic solution of K2Cr2O7, which of the following compounds is not produced?
• When an excess amount of sodium thiosulfate is combined with copper sulfate in water, the resulting product is:
• Among the given lanthanoid ions, which one exhibits diamagnetic behavior? (Atomic numbers: Ce = 58, Sm = 62, Eu = 63, Yb = 70)
• Which of these statements is accurate?

⚔️ Practice JEE Advanced Chemistry free + battle 1v1 →