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JEE Main202429 Jan 2024Morning ShiftChemistryGeneral Principles and Processes of Isolation of MetalsActual

Identify the incorrect pair from the following :

Options

  1. AFluorspar- BF 3
  2. BCryolite- Na 3 AlF 6
  3. CFluoroapatite- 3 Ca 3 PO 4 2 · CaF 2
  4. DCarnallite- KCl · MgCl 2 · 6 H 2 O

Correct answer

A. Fluorspar- BF 3

Step-by-step solution

Fluorine is present mainly as insoluble fluorides (fluorspar CaF 2 , cryolite Na 3 AlF 6 and fluoroapatite 3 Ca 3 ( PO 4 ) 2 . CaF 2 ). Sea water contains chlorides, bromides and iodides of sodium, potassium, magnesium and calcium, but is mainly sodium chloride solution (2.5% by mass). The deposits of dried up seas contain these compounds, e.g., sodium chloride and carnallite, KCl . MgCl 2 . 6 H 2 O .

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