JEE Main 2023 — Chemistry Inorganic Chemistry

2023mcqhard

Better method for preparation of ${\mathrm{BeF}}_{2}$ , among the following is

Official previous-year question

Held on 13 Apr 2023 · Verified 6 Jul 2026.

Options

A
$\mathrm{BeO}+C+{F}_{2}\overset{\Delta }{\longrightarrow }{\mathrm{BeF}}_{2}$
B
${({\mathrm{NH}}_{4})}_{2}{\mathrm{BeF}}_{4}\overset{\Delta }{\longrightarrow }{\mathrm{BeF}}_{2}$
C
$\mathrm{Be}+{F}_{2}\overset{\Delta }{\longrightarrow }{\mathrm{BeF}}_{2}$
D
${\mathrm{BeH}}_{2}+{F}_{2}\overset{\Delta }{\longrightarrow }{\mathrm{BeF}}_{2}$

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Solution

The beryllium fluoride cannot be easily prepared by simple methods. It is known that beryllium oxide dissolves in aqueous hydrofluoric acid with the formation of the fluoride, but on evaporation of the resulting solution some of the combined acid is lost, and the residue is believed to be an oxy fluoride.

Thermal decomposition of $({\mathrm{NH}}_{4}{)}_{2}{\mathrm{BeF}}_{4}$ , is the best route for the preparation of ${\mathrm{BeF}}_{2}$

${({\mathrm{NH}}_{4})}_{2}{\mathrm{BeF}}_{4}\longrightarrow 2{\mathrm{NH}}_{4}F+{\mathrm{BeF}}_{2}$

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JEE Main 2023 — Chemistry Inorganic Chemistry

2023mcqhard

Better method for preparation of ${\mathrm{BeF}}_{2}$ , among the following is

Official previous-year question

Held on 13 Apr 2023 · Verified 6 Jul 2026.

Options

A
$\mathrm{BeO}+C+{F}_{2}\overset{\Delta }{\longrightarrow }{\mathrm{BeF}}_{2}$
B
${({\mathrm{NH}}_{4})}_{2}{\mathrm{BeF}}_{4}\overset{\Delta }{\longrightarrow }{\mathrm{BeF}}_{2}$
C
$\mathrm{Be}+{F}_{2}\overset{\Delta }{\longrightarrow }{\mathrm{BeF}}_{2}$
D
${\mathrm{BeH}}_{2}+{F}_{2}\overset{\Delta }{\longrightarrow }{\mathrm{BeF}}_{2}$

Did you get this right?

Solution

Thermal decomposition of $({\mathrm{NH}}_{4}{)}_{2}{\mathrm{BeF}}_{4}$ , is the best route for the preparation of ${\mathrm{BeF}}_{2}$

${({\mathrm{NH}}_{4})}_{2}{\mathrm{BeF}}_{4}\longrightarrow 2{\mathrm{NH}}_{4}F+{\mathrm{BeF}}_{2}$

JEE Main 2023 — Chemistry Inorganic Chemistry

Options

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Solution

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JEE Main Inorganic Chemistry in other years

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Physical Chemistry

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JEE Main 2023 — Chemistry Inorganic Chemistry

Options

Did you get this right?

Solution

Your note

JEE Main Inorganic Chemistry in other years

More JEE Main Inorganic Chemistry questions

Other Chemistry topics for JEE Main

Physical Chemistry

Organic Chemistry

Keep practicing Inorganic Chemistry