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Halide Tests (named)
School halide test: acidify with dilute HNO₃, add AgNO₃. Precipitates: AgCl white, AgBr cream, AgI yellow. Solubility in ammonia helps confirm: AgCl dissolves in dilute NH₃, AgBr in concentrated NH₃, AgI remains insoluble. These are precipitate colours — not elemental halogen colours.
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Halide Tests (named)
What is it?
School halide test: acidify with dilute HNO₃, add AgNO₃. Precipitates: AgCl white, AgBr cream, AgI yellow. Solubility in ammonia helps confirm: AgCl dissolves in dilute NH₃, AgBr in concentrated NH₃, AgI remains insoluble. These are precipitate colours — not elemental halogen colours.
In simple words
- AgCl white, AgBr cream, AgI yellow after acidified AgNO₃.
- NH₃: AgCl dilute, AgBr concentrated, AgI stays.
- These are ppt colours, not elemental halogen colours.
What you should learn
- Explain Halide Tests (named) using Group 17 language.
- Link trends to size, shielding, forces and bond strength.
- Apply equations and observations in FBISE-style answers.
Recommended for Class 11
Full school-level explanation
School halide test: acidify with dilute HNO₃, add AgNO₃. Precipitates: AgCl white, AgBr cream, AgI yellow. Solubility in ammonia helps confirm: AgCl dissolves in dilute NH₃, AgBr in concentrated NH₃, AgI remains insoluble. These are precipitate colours — not elemental halogen colours.
Beginner
Add acid, then silver nitrate. White ppt = chloride; cream = bromide; yellow = iodide. Ammonia: white dissolves easily, cream needs concentrated ammonia, yellow stays.
Intermediate
Always acidify first. Quote AgCl/AgBr/AgI colours exactly. Use NH₃ ladder for confirmation. Never swap elemental Br₂ red-brown with AgBr cream.
Advanced
Acidification removes interfering anions that also precipitate with Ag⁺. Ammonia works by forming soluble silver–ammine complexes for AgCl and (with concentrated NH₃) AgBr; AgI’s lattice/low solubility keeps it out of solution in the school model.
Remember
AgCl white · AgBr cream · AgI yellow · dilute NH₃ dissolves AgCl · conc NH₃ dissolves AgBr · AgI stays · NOT elemental colours.
Deeper understanding
Go deeper on Halide Tests (named): connect the definition to reasons, relationships, exceptions, and exam wording.
Common mistakes
Exam focus
Precipitate colours
Method
NH₃ ladder
Not the same as
Exam focus
Quick revision
- Beginner: Add acid, then silver nitrate. White ppt = chloride; cream = bromide; yellow = iodide. Ammonia: wh
- Intermediate: Always acidify first. Quote AgCl/AgBr/AgI colours exactly. Use NH₃ ladder for confirmation. Never sw
- AgCl white, AgBr cream, AgI yellow after acidified AgNO₃.
- NH₃: AgCl dilute, AgBr concentrated, AgI stays.
- These are ppt colours, not elemental halogen colours.
For long answers on Halide Tests (named): define clearly → explain the main parts → give one example → state one exam caution.
Exam Focus
Exam Focus
Important points
- Beginner: Add acid, then silver nitrate. White ppt = chloride; cream = bromide; yellow = iodide. Ammonia: wh
- Intermediate: Always acidify first. Quote AgCl/AgBr/AgI colours exactly. Use NH₃ ladder for confirmation. Never sw
- AgCl white, AgBr cream, AgI yellow after acidified AgNO₃.
- NH₃: AgCl dilute, AgBr concentrated, AgI stays.
Common exam traps
- Calling AgBr red-brown (that is Br₂, not AgBr).
- Skipping acidification and getting fake precipitates.
Long question structure
Definition → key parts → example → exam caution
Common Mistakes
Common Mistakes
- Mistake
Calling AgBr red-brown (that is Br₂, not AgBr).
- Mistake
Skipping acidification and getting fake precipitates.
- Mistake
Saying AgI dissolves in dilute ammonia.
- Mistake
Mixing halide-test colours with halogen vapour colours.
Revision Zone
60-Second Revision
Quick cues from this topic — use them for last-minute revision.
Beginner: Add acid, then silver nitrate. White ppt = chloride; cream = bromide; yellow = iodide. Ammonia: wh
Intermediate: Always acidify first. Quote AgCl/AgBr/AgI colours exactly. Use NH₃ ladder for confirmation. Never sw
AgCl white, AgBr cream, AgI yellow after acidified AgNO₃.
NH₃: AgCl dilute, AgBr concentrated, AgI stays.
School halide test: acidify with dilute HNO₃, add AgNO₃. Precipitates: AgCl white, AgBr cream, AgI yellow. Solubility in ammonia helps confirm: AgCl dissolves i
- Definition
- School halide test: acidify with dilute HNO₃, add AgNO₃. Precipitates: AgCl white, AgBr cream, AgI yellow. Solubility in ammonia helps confirm: AgCl dissolves i
- Critical warning
- Calling AgBr red-brown (that is Br₂, not AgBr).
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Exam Practice
Define
Q1. Define Halide Tests (named).
Explain
Q2. Explain: Beginner.
Example
Q3. Give one clear example of Halide Tests (named) and say why it fits.
Mistake
Q4. State one common mistake students make about Halide Tests (named).
Exam note
Q5. Write a short exam note on Halide Tests (named): definition, two points, one example.
Sources & References
School-standard facts for Matric and Intermediate. Original explanations — not copied from textbooks.