Question

Identify the incorrect pair from the following:

• A. Fluorspar - \( \text{BF}_3 \)
• B. Cryolite - \( \text{Na}_3\text{AlF}_6 \)
• C. Fluoroapatite - \( 3\text{Ca}_3(\text{PO}_4)_2 \cdot \text{CaF}_2 \)
• D. Carnallite - \( \text{KCl} \cdot \text{MgCl}_2 \cdot 6\text{H}_2\text{O} \)

Answer 1

The Correct Option is A

To address this question, each mineral's name must be paired with its chemical formula, and the incorrect association identified.

1. Fluorspar - The correct formula for fluorspar is \(CaF_2\), not \(BF_3\). This pairing is erroneous.
2. Cryolite - The provided formula, \(Na_3AlF_6\), accurately represents cryolite. This pairing is correct.
3. Fluoroapatite - The formula stated, \(3Ca_3(PO_4)_2 \cdot CaF_2\), is the correct chemical representation for fluoroapatite. This pairing is correct.
4. Carnallite - The given formula, \(KCl \cdot MgCl_2 \cdot 6H_2O\), is the correct formula for carnallite. This pairing is correct.

The erroneous pairing identified is:

Fluorspar - \(BF_3\)

This is incorrect because fluorspar's actual chemical composition is \(CaF_2\).