Identify the incorrect pair from the following:
- Fluorspar - \( \text{BF}_3 \)
- Cryolite - \( \text{Na}_3\text{AlF}_6 \)
- Fluoroapatite - \( 3\text{Ca}_3(\text{PO}_4)_2 \cdot \text{CaF}_2 \)
- Carnallite - \( \text{KCl} \cdot \text{MgCl}_2 \cdot 6\text{H}_2\text{O} \)
The Correct Option is A
Approach Solution - 1
To solve this question, we need to match each mineral's name with its chemical formula and identify the incorrect pair.
- Fluorspar - The correct formula for fluorspar is \(CaF_2\), not \(BF_3\). Therefore, this pair is incorrect.
- Cryolite - The formula given is \(Na_3AlF_6\), which is correct for cryolite. Hence, this pair is correct.
- Fluoroapatite - The given formula is \(3Ca_3(PO_4)_2 \cdot CaF_2\), which is indeed correct for fluoroapatite. So, this pair is correct.
- 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 \(CaF_2\).
Approach Solution -2
Fluorspar is actually CaF2, not BF3. BF3 does not represent Fluorspar, which makes option (1) incorrect.
So, the correct answer is : Option (1)
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