Limestone is a naturally occuring form of calcium carbonate. It is used as building materials and also for manufacture of other building materials such as portland cement. It is used for the production of quickline and slaked lime which have wide applications in chemical, metallugical and construction industry. The pure `CaCO_(3)`, called precipitated calcium carbonate, is used extensively as filler, providing bulk to materials such as paint, plastics, printing links and rubber. it is also used in toothpastes, cosmetics and antacids. Quicklime and slaked lime are the cheapest and the most widely used bases for neutralising unwanted acids. Lime is used to neutralise acidic soils. An important application of quicklime is in air pollution control for the removal of `SO_(2)` in electric power plants. slaked lime is used in the manufature of other alkalis and bleacing powder, in sugar refinig, in tanning hide and in water softening.
Quicklime is used in electric power plants with carbon to check pollution. What product of calcium is formed?

Options

A. `CaSO_(3)`
B. `CaSO_(4)`
C. `CaS`
D. `CaSO_(4).10H_(2)O`

Explanation

To solve the question regarding the product formed when quicklime (calcium oxide, CaO) is used in electric power plants with carbon to check pollution, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Reactants**:
- Quicklime is calcium oxide (CaO).
- The problem states that quicklime is used in electric power plants with carbon.

2. **Understand the Reaction**:
- Quicklime (CaO) is known to react with sulfur dioxide (SO₂) to help remove it from emissions.
- The reaction can be represented as:
\[ \text{CaO} + \text{SO}_2 \rightarrow \text{CaSO}_3 \]
- Here, calcium oxide reacts with sulfur dioxide to form calcium sulfite (CaSO₃).

3. **Consider the Role of Carbon**:
- While the question mentions carbon, the primary focus is on the reaction between CaO and SO₂. Carbon may play a role in reducing other pollutants or in the overall process of combustion, but it does not directly participate in the formation of the product in this context.

4. **Write the Final Product**:
- The product formed from the reaction of quicklime with sulfur dioxide is calcium sulfite (CaSO₃).

### Final Answer:
The product of calcium formed when quicklime is used in electric power plants with carbon to check pollution is **calcium sulfite (CaSO₃)**.

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