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By adding gypsum to cement...

By adding gypsum to cement

A

setting time of cement becomes less

B

setting time of cement increases

C

colour of cement becomes light

D

shining surface is obtained

Text Solution

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The correct Answer is:
### Step-by-Step Solution: 1. **Identify the Chemical Composition of Gypsum**: - Gypsum is chemically known as hydrated calcium sulfate. - Its chemical formula is \( \text{CaSO}_4 \cdot 2\text{H}_2\text{O} \). 2. **Understand the Role of Gypsum in Cement**: - When cement is mixed with water, it undergoes an exothermic reaction, producing a significant amount of heat. - This rapid heat generation causes the cement to set quickly, which can be problematic for construction workers as they have limited time to work with the material. 3. **Effect of Gypsum on Cement Setting Time**: - Gypsum is added to cement to slow down the setting process. - It acts as a coolant, reducing the heat produced during the hydration of cement. - As a result, the setting time of the cement increases, allowing workers more time to manipulate and shape the cement before it hardens. 4. **Evaluate the Options Given in the Question**: - **Option A**: Setting time of cement becomes less - This is incorrect. - **Option B**: Setting time of cement increases - This is correct. - **Option C**: Color of cement becomes light - This is incorrect. - **Option D**: Shining surface is obtained - This is incorrect. 5. **Conclusion**: - The correct answer is that by adding gypsum to cement, the setting time of cement increases.
### Step-by-Step Solution: 1. **Identify the Chemical Composition of Gypsum**: - Gypsum is chemically known as hydrated calcium sulfate. - Its chemical formula is \( \text{CaSO}_4 \cdot 2\text{H}_2\text{O} \). 2. **Understand the Role of Gypsum in Cement**: - When cement is mixed with water, it undergoes an exothermic reaction, producing a significant amount of heat. ...
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