Consider the following isomers.
(i) [Pt`(NH_(3))_(4)Cl_(2)]Br_(2) " " (ii) [Pt (NH_(3))_(4) Br_(2)]Cl_(2)`
(iii) `[Co(NH_(3))_(4)Cl_(2)] NO_(2)`
Which of the following observations is correct ?

Options

A. (i) will give a part yellow and (ii) will give a white precipitate with `AgNO_(3)` solution .
B. (iii) will give a white precipitate with `AgNO_(3)` solution .
C. (i) , (ii) and (iii) will give white precipitate with `AgNO_(3)` solution .
D. None of the above isomers will give white precipitate with `AgNO_(3)` solution .

Explanation

To determine the correct observation regarding the given isomers, we will analyze each complex and its reaction with AgNO3.

### Step-by-Step Solution:

1. **Identify the Isomers:**
- (i) [Pt(NH₃)₄Cl₂]Br₂
- (ii) [Pt(NH₃)₄Br₂]Cl₂
- (iii) [Co(NH₃)₄Cl₂]NO₂

2. **React Each Isomer with AgNO3:**
- **For (i) [Pt(NH₃)₄Cl₂]Br₂:**
- In aqueous medium, it dissociates to form [Pt(NH₃)₄Cl₂]²⁺ and 2 Br⁻.
- When reacted with AgNO3, it will produce [Pt(NH₃)₄Cl₂](NO₃)₂ and 2 AgBr.
- AgBr is a pale yellow precipitate.

- **For (ii) [Pt(NH₃)₄Br₂]Cl₂:**
- In aqueous medium, it dissociates to form [Pt(NH₃)₄Br₂]²⁺ and 2 Cl⁻.
- When reacted with AgNO3, it will produce [Pt(NH₃)₄Br₂](NO₃)₂ and 2 AgCl.
- AgCl is a white precipitate.

- **For (iii) [Co(NH₃)₄Cl₂]NO₂:**
- In aqueous medium, it dissociates to form [Co(NH₃)₄Cl₂]²⁺ and NO₃⁻.
- When reacted with AgNO3, there is no reaction because the nitrate ion does not precipitate with silver ions.
- Therefore, no precipitate is formed.

3. **Summarize the Results:**
- (i) Produces a pale yellow precipitate (AgBr).
- (ii) Produces a white precipitate (AgCl).
- (iii) No precipitate.

4. **Conclusion:**
- The correct observation is that the first isomer gives a pale yellow precipitate, the second isomer gives a white precipitate, and the third does not give any precipitate with AgNO3. Therefore, the statement that "none of the above isomer will give white precipitate with AgNO3 solution" is incorrect.

### Final Answer:
The correct observation is that the second isomer ([Pt(NH₃)₄Br₂]Cl₂) will give a white precipitate with AgNO3.

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