The lime which contains high percentage of calcium oxide is generally called................
Correct Answer:
D. All of the above
📜 Understanding High-Purity Lime
Lime that contains a high percentage of calcium oxide (typically >95%) is known by several names. These names often describe a particular characteristic of the lime, but they all refer to the same high-quality material derived from pure limestone.
🔬 Detailed Analysis of the Options
This question tests the knowledge of synonyms for high-purity lime. Let's analyze each option.
D. All of the above
This is the correct answer. All the given terms—Fat lime, Rich lime, and White lime—are used interchangeably in the industry to describe lime with a high percentage of calcium oxide.
- Fat Lime: This name is used because the lime swells significantly (gets "fat") to 2 to 2.5 times its original volume when slaked with water.
- Rich Lime: This name refers to its high purity or "richness" in calcium oxide content.
- White Lime: This name simply describes its appearance, as high-purity lime is typically bright white.
Since options A, B, and C are all valid names for the same material, "All of the above" is the most complete and correct choice.
📊 Summary: Synonyms for High-Purity Lime
| Name | Reason for the Name | Refers To |
|---|---|---|
| Fat Lime | Swells ("gets fat") upon slaking. | High-purity quicklime (CaO) |
| Rich Lime | "Rich" in calcium oxide content. | High-purity quicklime (CaO) |
| White Lime | Its characteristic white color. | High-purity quicklime (CaO) |
💡 Study Tips
- Memorize the Synonyms: The key takeaway is that Fat Lime = Rich Lime = White Lime = Pure Lime. All refer to high-purity CaO.
- Understand the "Why": Knowing why each name is used (Fat for swelling, Rich for purity, White for color) makes them easier to remember.
- Watch for "All of the above": When you see multiple terms that you know are synonyms, look for an "All of the above" option, as it is likely the intended correct answer.