Aqueous hypo solution on reaction with aqueous `AgNO_(3)` gives :

Options

A. yellow precipitate changing to black
B. white precipitate changing to black
C. orange precipitate to blue
D. no precipitate

Explanation

To solve the problem of what happens when aqueous hypo solution (sodium thiosulfate, Na2S2O3) reacts with aqueous AgNO3, we can break down the reaction step by step.

### Step-by-Step Solution:

1. **Identify the Reactants**:
- Aqueous hypo solution is sodium thiosulfate, which has the formula Na2S2O3.
- Aqueous AgNO3 is silver nitrate, which has the formula AgNO3.

2. **Write the Chemical Reaction**:
- When sodium thiosulfate reacts with silver nitrate, the reaction can be represented as:
\[ \text{Na}_2\text{S}_2\text{O}_3 (aq) + 2 \text{AgNO}_3 (aq) \rightarrow \text{Ag}_2\text{S}_2\text{O}_3 (s) + 2 \text{NaNO}_3 (aq) \]
- Here, silver thiosulfate (Ag2S2O3) is formed as a precipitate along with sodium nitrate (NaNO3).

3. **Identify the Precipitate**:
- The product Ag2S2O3 is a white precipitate that forms during the reaction.

4. **Further Reaction of Silver Thiosulfate**:
- Silver thiosulfate (Ag2S2O3) is soluble in water and can further react with water:
\[ \text{Ag}_2\text{S}_2\text{O}_3 (s) + \text{H}_2\text{O} \rightarrow \text{Ag}_2\text{S} (s) + \text{H}_2\text{SO}_4 (aq) \]
- This reaction produces a black precipitate of silver sulfide (Ag2S) and sulfuric acid (H2SO4).

5. **Final Observation**:
- Initially, a white precipitate of silver thiosulfate is formed, which then transforms into a black precipitate of silver sulfide upon further reaction with water.

### Conclusion:
The reaction of aqueous hypo solution with aqueous AgNO3 results in the formation of a white precipitate of silver thiosulfate, which subsequently changes to a black precipitate of silver sulfide.