Which of the following imparts green colour to the glass

Options

A. `Cu_(2)O`
B. `CdS`
C. `MnO_(2)`
D. `Cr_(2)O_(3)`

Answer

To determine which substance imparts a green color to glass, we can follow these steps:

### Step 1: Identify the Options
First, we need to identify the options provided in the question. Common substances known to color glass include chromium, iron, cobalt, and manganese.

### Step 2: Understand the Role of Chromium
Chromium compounds, particularly chromium(III) oxide (Cr2O3), are known for their ability to impart a green color to glass. This is due to the specific wavelengths of light that are absorbed and transmitted by the chromium ions in the glass matrix.

### Step 3: Consider Other Elements
While chromium is a strong colorizing agent, we should also consider other elements:
- **Iron** can also impart a green color, especially in its ferrous (Fe2+) state.
- **Cobalt** typically gives a blue color.
- **Manganese** can give a purple or pink hue depending on its oxidation state.

### Step 4: Conclusion
Based on the information about colorizing agents, we conclude that chromium is a powerful colorizing agent and is primarily responsible for imparting a green color to glass. Therefore, the answer to the question is chromium.

### Final Answer
Chromium is the element that imparts green color to the glass.

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