Question

Which among the following are NOT the alternative names of Magnesium Oxide Cement?
A. Eco-cement
B. White cement
C. Lime
D. Gypsum
Choose the correct answer from the options given below:

• A. A, B and C only
• B. A, C and D only
• C. B, C and D only
• D. A, B and D only

Hint:

Magnesium oxide cement is also known as Sorel cement, magnesia cement, or eco-cement.
Other traditional binders like lime, gypsum, and white cement are chemically different.

Answer 1

The Correct Option is C

Step 1: Understanding the Concept:
Cementing and binding materials are used in construction and interior finishes.
Magnesium oxide cement (often called Sorel cement) is a non-hydraulic cement made by mixing powdered magnesium oxide with a magnesium chloride solution.

Step 2: Detailed Explanation:
Let us evaluate each material name:
- A. Eco-cement: This is a common alternative name for Magnesium Oxide Cement.
Because its manufacturing process requires lower temperatures and absorbs atmospheric carbon dioxide as it cures, it is considered an environmentally friendly alternative to traditional Portland cement.
- B. White cement: This is a variety of Portland cement made from raw materials with low iron and manganese content, giving it a white color. It is chemically distinct from magnesium oxide cement.
- C. Lime: This is calcium oxide or calcium hydroxide, a traditional binder made by calcining limestone, and is not an alternative name for magnesium oxide cement.
- D. Gypsum: This is hydrated calcium sulfate ($CaSO_{4} \cdot 2H_{2}O$), a separate material used to manufacture plaster of Paris and wallboards.
Therefore, White cement, Lime, and Gypsum are distinct binding materials and are NOT alternative names for Magnesium Oxide Cement.

Step 3: Final Answer:
The names that are NOT alternative names for Magnesium Oxide Cement are B, C, and D, corresponding to Option (C).