Which of the following solutions will turn violet when a drop of lime juice is added to it ?

Options

A. A solution of NaI
B. A solution mixture of KI and `NaIO_(3)`
C. A solution mixture of NaI and KI
D. A solution mixture of `KIO_(3) and NaIO_(3)`

Explanation

To determine which solution will turn violet when a drop of lime juice is added, we need to consider the pH of lime juice and its effect on indicators. Lime juice is acidic due to the presence of citric acid, which has a pH of around 2-3.

Here’s a step-by-step solution:

### Step 1: Identify the Indicators
First, we need to identify the indicators that can change color in response to pH changes. Common indicators include litmus, phenolphthalein, and bromothymol blue.

### Step 2: Understand the Color Change
- **Litmus**: Turns red in acidic solutions and blue in basic solutions.
- **Phenolphthalein**: Colorless in acidic solutions and turns pink in basic solutions.
- **Bromothymol Blue**: Yellow in acidic solutions and blue in basic solutions.

### Step 3: Analyze the Effect of Lime Juice
Since lime juice is acidic, we need to find an indicator that will change color in acidic conditions.

### Step 4: Determine Which Solution Turns Violet
In this case, we need to find out if any of the indicators mentioned above can turn violet when lime juice is added.

- If we add lime juice to a solution containing phenolphthalein, it will remain colorless since phenolphthalein does not change color in acidic conditions.
- If we add lime juice to a solution containing bromothymol blue, it will turn yellow.
- If we add lime juice to a solution containing litmus, it will turn red.

### Step 5: Conclusion
None of the common indicators will turn violet when lime juice is added. However, if the solution contains a specific combination of indicators or a complex solution that can react to the acidity of lime juice, it might result in a violet color.

Thus, based on the common indicators, the answer to the question is that none of the solutions will turn violet when lime juice is added.