Qualitative Test For Fe3+
Mediumchemistry
Fe3+ produces blood-red coloration with thiocyanate due to formation of:
Select the correct option:
Solution
Incorrect! Answer:
[Fe(SCN)]2+complex(blood−red)
- Test Reagent: Potassium thiocyanate (KSCN) or Ammonium thiocyanate.
- Chemical Reaction: Fe3++SCN−⇌[Fe(SCN)]2+.
- Observation: The formation of the ferric thiocyanate complex results in an intense, characteristic blood-red coloration in the solution.
- Reliability: This is an extremely sensitive test used to detect even trace amounts of Iron(III) ions.
- Note: Fluoride ions can interfere with this test by forming a more stable, colorless hexa-fluoro complex [FeF6]3−.
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About This Question
- Subject
- chemistry
- Chapter
- practical chemistry
- Topic
- qualitative test for fe3+
- Difficulty
- Medium
- Year
- 2025
Solution
Correct Answer:
[Fe(SCN)]2+complex(blood−red)
- Test Reagent: Potassium thiocyanate (KSCN) or Ammonium thiocyanate.
- Chemical Reaction: Fe3++SCN−⇌[Fe(SCN)]2+.
- Observation: The formation of the ferric thiocyanate complex results in an intense, characteristic blood-red coloration in the solution.
- Reliability: This is an extremely sensitive test used to detect even trace amounts of Iron(III) ions.
- Note: Fluoride ions can interfere with this test by forming a more stable, colorless hexa-fluoro complex [FeF6]3−.
This medium difficulty chemistry question is from the chapter practical chemistry, covering the topic of qualitative test for fe3+. It appeared in the 2025 exam.
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