Question

Which of the following compounds are correctly matched with their uses?

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

Hint:

Know industrial uses: CaCO$_3$ for antacids, CaO for cement, CaSO$_4$ hemihydrate for fillers. Glass making typically involves silicates and carbonates, not hydroxides. Verify chemical applications.

Answer 1

The Correct Option is A

1. A. CaCO$_3$: Used as an antacid to neutralize stomach acid, correct.
2. B. CaO: Key ingredient in cement production (forms clinker), correct.
3. C. Ca(OH)$_2$: Used in mortar, not directly in glass making (which uses Na$_2$CO$_3$, CaCO$_3$), so incorrect.
4. D. CaSO$_4\cdot\frac{1}{2}$H$_2$O (plaster of Paris): Used as a filler in cosmetics and other industries, correct.
5. Thus, A, B, D are correct, so the answer is (1) A, B, D only.