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P Block Elements question

2024 · 29 Jan · Shift 1 · Q1
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P Block Elements question

2024 · 29 Jan · Shift 1 · Q1

JEE MainChemistryP Block ElementsMCQ+4 / −1
Identify the incorrect pair from the following :
  1. A
    Fluoroapatite −3Ca3(PO4)2⋅CaF2-3 \mathrm{Ca}_3\left(\mathrm{PO}_4\right)_2 \cdot \mathrm{CaF}_2−3Ca3​(PO4​)2​⋅CaF2​
  2. B
    Carnallite −KCl⋅MgCl2⋅6H2O-\mathrm{KCl} \cdot \mathrm{MgCl}_2 \cdot 6 \mathrm{H}_2 \mathrm{O}−KCl⋅MgCl2​⋅6H2​O
  3. C
    Cryolite −Na3AlF6-\mathrm{Na}_3 \mathrm{AlF}_6−Na3​AlF6​
  4. D
    Fluorspar −BF3-\mathrm{BF}_3−BF3​
View written solutionFree

Correct answer: D

  1. We need to identify the incorrect mineral-formula pair.

  2. Check each option:

    A. Fluoroapatite

    Fluoroapatite is commonly written as 3Ca3(PO4)2⋅CaF23\mathrm{Ca}_3(\mathrm{PO}_4)_2\cdot \mathrm{CaF}_23Ca3​(PO4​)2​⋅CaF2​ or equivalently Ca10(PO4)6F2\mathrm{Ca}_{10}(\mathrm{PO}_4)_6\mathrm{F}_2Ca10​(PO4​)6​F2​ So, A is correct.

    B. Carnallite

    Carnallite has the formula KCl⋅MgCl2⋅6H2O\mathrm{KCl}\cdot \mathrm{MgCl}_2\cdot 6\mathrm{H}_2\mathrm{O}KCl⋅MgCl2​⋅6H2​O So, B is correct.

    C. Cryolite

    Cryolite is Na3AlF6\mathrm{Na}_3\mathrm{AlF}_6Na3​AlF6​ So, C is correct.

    D. Fluorspar

    Fluorspar is actually CaF2\mathrm{CaF}_2CaF2​ not BF3\mathrm{BF}_3BF3​. BF3\mathrm{BF}_3BF3​ is boron trifluoride, not fluorspar. So, D is incorrect.

  3. Therefore, the incorrect pair is: D\boxed{D}D​

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