Anion Detection
Chromyl chloride test is used to detect:
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About This Question
- Subject
- chemistry
- Chapter
- principles related to practical chemistry
- Topic
- anion detection
- Difficulty
- Easy
- Year
- 2025
Solution
Correct Answer:
Chloride
The Chromyl Chloride Test is a specific confirmatory test for the Chloride (Cl−) ion.
- Reaction: Salt mixed with solid K2Cr2O7 and concentrated H2SO4 and heated.
- Result: Formation of deep red vapors of Chromyl Chloride (CrO2Cl2).
- Confirmatory: Vapors passed through NaOH give a yellow solution (Sodium chromate), which yields a yellow precipitate of Lead chromate (PbCrO4) upon adding acetic acid and lead acetate.
- Note: Bromides and Iodides do not give this test; instead, they are oxidized to free halogens (Br2 or I2).
This easy difficulty chemistry question is from the chapter principles related to practical chemistry, covering the topic of anion detection. It appeared in the 2025 exam.
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