Question

What is the formula of calamine?

• A. \( \text{ZnCO}_3 \)
• B. \( \text{MgCO}_3, \, \text{CaCO}_3 \)
• C. \( \text{Fe}_2\text{O}_3 \)
• D. \( \text{FeCO}_3 \)

Hint:

Calamine is zinc carbonate, often used in topical treatments for skin conditions.

Answer 1

The Correct Option is A

Step 1: Understanding the compound.
Calamine is commonly known as zinc carbonate. The correct formula for calamine is \( \text{ZnCO}_3 \).

Step 2: Analyzing the options.
(A) \( \text{ZnCO}_3 \): This is the correct formula for calamine, a compound used in lotions and ointments.
(B) \( \text{MgCO}_3, \, \text{CaCO}_3 \): These are formulas for magnesium and calcium carbonates, respectively, not calamine.
(C) \( \text{Fe}_2\text{O}_3 \): This is the formula for iron(III) oxide, not calamine.
(D) \( \text{FeCO}_3 \): This is iron carbonate, which is not calamine.

Step 3: Conclusion.
The correct answer is (A) \( \text{ZnCO}_3 \), as it is the formula for calamine.