Chemistry · Ionic Equilibrium
In qualitative analysis, Group III cations (Al3+, Fe3+, Cr3+) are precipitated as hydroxides by adding NH4OH in the presence of NH4Cl. Which of the following statements are correct? A) The common ion effect of [OH-] maintains a high concentration of hydroxide ions. B) Group III cations require higher hydroxide concentrations than higher groups. C) Group III cations precipitate as hydroxides because their Ksp values are sufficiently low to precipitate at low [OH-] concentrations. D) The presence of NH4+ ions suppresses the degree of dissociation of NH4OH, thereby controlling [OH-] concentration to prevent precipitation of later groups.
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1Only D
- 2Both C and D✓
- 3Both A and B
- 4Only A
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Both C and D
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