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 solve this question, we need to match each mineral's name with its chemical formula and identify the incorrect pair.

1. Fluorspar - The correct formula for fluorspar is \(CaF_2\), not \(BF_3\). Therefore, this pair is incorrect. 
2. Cryolite - The formula given is \(Na_3AlF_6\), which is correct for cryolite. Hence, this pair is correct.
3. Fluoroapatite - The given formula is \(3Ca_3(PO_4)_2 \cdot CaF_2\), which is indeed correct for fluoroapatite. So, this pair is correct.
4. Carnallite - The given formula is \(KCl \cdot MgCl_2 \cdot 6H_2O\), which correctly represents carnallite. Hence, this pair is correct.

In conclusion, the incorrect pair is:

Fluorspar - \(BF_3\)

This is because the correct chemical composition of fluorspar is \(CaF_2\).

Answer 2

Fluorspar is actually CaF₂, not BF₃. BF₃ does not represent Fluorspar, which makes option (1) incorrect.

So, the correct answer is : Option (1)