During roasting & calcination emitteg gases procduce which of the following effect

Options

A. Photochecmical smog, acid rain
B. acid rain, global warming
C. photochemical smog, global warming
D. acid rain, ozone depetion

Answer

To solve the question regarding the effects of gases emitted during roasting and calcination, we will analyze the processes involved and the resulting emissions.

### Step-by-Step Solution:

1. **Understanding Calcination**:
- Calcination is the process of heating an ore in the absence of oxygen or in a limited supply of oxygen.
- This process typically converts carbonate ores into oxides and releases carbon dioxide (CO2) gas.
- **Example**: Heating calcium carbonate (CaCO3) results in calcium oxide (CaO) and CO2.

2. **Understanding Roasting**:
- Roasting involves heating an ore in the presence of oxygen.
- This process converts sulfide ores into oxides and releases sulfur dioxide (SO2) gas.
- **Example**: Heating zinc sulfide (ZnS) in the presence of oxygen produces zinc oxide (ZnO) and SO2.

3. **Identifying Emitted Gases**:
- From calcination, the emitted gas is CO2.
- From roasting, the emitted gas is SO2.

4. **Analyzing the Effects of Emitted Gases**:
- **Effect of CO2**:
- CO2 is a greenhouse gas that contributes to global warming by trapping heat in the atmosphere.
- **Effect of SO2**:
- SO2 can react with water in the atmosphere to form sulfuric acid (H2SO4), leading to acid rain.

5. **Conclusion**:
- The gases emitted during roasting and calcination lead to two significant environmental effects: global warming (due to CO2) and acid rain (due to SO2).
- Therefore, the correct answer to the question is: **Global warming and acid rain**.

### Final Answer:
The effects produced by the gases emitted during roasting and calcination are **global warming and acid rain**.

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