A mixture of lime paste is sand, water and

Options

A. Gypsum
B. Slacked lime
C. Quick lime
D. Lime stone

Answer

To solve the question, we need to identify the correct component that, when mixed with sand and water, forms lime paste. Let's analyze the options provided:

1. **Gypsum (CaSO4·2H2O)**: Gypsum is a hydrated sulfate mineral. It is not typically used to create lime paste.

2. **Slag Lime (Ca(OH)2)**: Slag lime is also known as hydrated lime or calcium hydroxide. While it is related to lime, it is not the primary component used to create lime paste when mixed with sand and water.

3. **Quick Lime (CaO)**: Quick lime, or calcium oxide, is produced by heating limestone. When quick lime is mixed with water, it forms calcium hydroxide, which is the basis for lime paste.

4. **Limestone (CaCO3)**: Limestone is a sedimentary rock composed mainly of calcium carbonate. It is not used directly to create lime paste.

Now, let's summarize the steps to arrive at the correct answer:

### Step-by-Step Solution:

1. **Identify the components of lime paste**: Lime paste is typically made by mixing quick lime (CaO) with water and sand.

2. **Analyze the options**:
- Gypsum does not contribute to lime paste.
- Slag lime (Ca(OH)2) is a product of quick lime but is not the direct component mixed to create lime paste.
- Quick lime (CaO) is the key ingredient that, when mixed with water, forms the lime paste.
- Limestone (CaCO3) is not used directly in the paste.

3. **Select the correct option**: Since quick lime (CaO) is the component that, when mixed with water, forms lime paste, the correct answer is **Quick Lime (CaO)**.

### Final Answer:
The correct answer is **Quick Lime (CaO)**.

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