You were asked to perform an experiment to show the presence of starch in food. Some food samples and a number of solutions were given to you. Among the following solutions which one would you choose to confirm starch test?

Options

A. Benedicts solution (blue colour)
B. Iodine solution
C. Copper sulphate solution + caustic soda
D. Sodium sulphate solution

Explanation

To confirm the presence of starch in food, follow these steps:

### Step-by-Step Solution:

1. **Gather Materials**: Collect the food samples you want to test and iodine solution. Iodine solution is the reagent used to test for starch.

2. **Prepare the Food Sample**: If the food sample is solid (like a piece of bread or potato), you may need to cut it into smaller pieces or crush it to expose more surface area. If it's a liquid (like juice), you can use it directly.

3. **Add Iodine Solution**: Take the food sample in a clean test tube or a small dish. Add 2-3 drops of iodine solution directly onto the food sample.

4. **Observe the Color Change**: Watch closely for any color change in the food sample after adding the iodine solution.

5. **Interpret the Results**:
- If the color of the food sample changes to blue-black, this indicates the presence of starch (positive result).
- If there is no color change, the food sample does not contain starch (negative result).

### Conclusion:
The solution you would choose to confirm the starch test is iodine solution.

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