JEE Main 202429 JanuaryMorning Shift

Exam: JEE Main
Year: 2024
Date: 29 January
Shift: Morning Shift
Subject: Chemistry
Chapter: General Principles and Processes of Isolation of Metals

JEE Main 2024 · 29 January · Morning Shift · Chemistry · General Principles and Processes of Isolation of Metals

Identify the incorrect pair from the following :

Options

AFluorspar- ${BF}_{3}$
BCryolite- ${Na}_{3}{AlF}_{6}$
CFluoroapatite- $3{Ca}_{3}{\left({PO}_{4}\right)}_{2} \cdot {CaF}_{2}$
DCarnallite- $KCl \cdot {MgCl}_{2} \cdot 6{H}_{2}O$

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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