When a basic solution is added to an indicator, a green colour is produced. The indicator should be :

Options

A. red litmus indicator
B. china rose indicator
C. phenolphthalein indicator
D. turmeric paper indicator

Answer

To determine which indicator produces a green color when a basic solution is added, we can follow these steps:

### Step 1: Understand the Problem
We know that when a basic solution is added to an indicator, it produces a green color. We need to identify which indicator is responsible for this color change.

### Step 2: Identify Common Indicators
There are several common indicators used in chemistry to determine acidity or basicity, including:
- Litmus
- Phenolphthalein
- Turmeric
- China rose (also known as hibiscus)

### Step 3: Analyze the Color Changes of Each Indicator
- **Litmus Indicator**: Turns blue in basic solutions and red in acidic solutions.
- **Phenolphthalein**: Turns pink in basic solutions and remains colorless in acidic solutions.
- **Turmeric**: Turns red in basic solutions and remains yellow in acidic solutions.
- **China Rose Indicator**: Turns green in basic solutions and magenta (dark pink) in acidic solutions.

### Step 4: Match the Color Change to the Indicator
Since we are looking for an indicator that turns green in a basic solution, we can see that:
- The **China Rose Indicator** is the only one that produces a green color when a basic solution is added.

### Step 5: Conclusion
Thus, the indicator that produces a green color when a basic solution is added is the **China Rose Indicator**.

### Final Answer:
The indicator should be **China Rose Indicator**.

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