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1
JEE Main 2023 (Online) 13th April Evening Shift
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
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Better method for preparation of $$\mathrm{BeF}_{2}$$, among the following is :

A
$$\mathrm{BeH}_{2}+\mathrm{F}_{2} \stackrel{\Delta}{\longrightarrow} \mathrm{BeF}_{2}$$
B
$$\left(\mathrm{NH}_{4}\right)_{2} \mathrm{BeF}_{4} \stackrel{\Delta}{\longrightarrow} \mathrm{BeF}_{2}$$
C
$$\mathrm{Be}+\mathrm{F}_{2} \stackrel{\Delta}{\longrightarrow} \mathrm{BeF}_{2}$$
D
$$\mathrm{BeO}+\mathrm{C}+\mathrm{F}_{2} \stackrel{\Delta}{\longrightarrow} \mathrm{BeF}_{2}$$
2
JEE Main 2023 (Online) 13th April Evening Shift
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language

Identify the correct order of standard enthalpy of formation of sodium halides :

A
$$\mathrm{NaI}<\mathrm{NaBr}<\mathrm{NaCl}<\mathrm{NaF}$$
B
$$\mathrm{NaI}<\mathrm{NaBr}<\mathrm{NaF}<\mathrm{NaCl}$$
C
$$\mathrm{NaF}<\mathrm{NaCl}<\mathrm{NaBr}<\mathrm{NaI}$$
D
$$\mathrm{NaCl}<\mathrm{NaF}<\mathrm{NaBr}<\mathrm{NaI}$$
3
JEE Main 2023 (Online) 13th April Morning Shift
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language

$$\mathrm{Be}(\mathrm{OH})_{2}$$ reacts with $$\mathrm{Sr}(\mathrm{OH})_{2}$$ to yield an ionic salt.

Choose the incorrect option related to this reaction from the following :

A
Be is tetrahedrally coordinated in the ionic salt.
B
The element $$\mathrm{Be}$$ is present in the cationic part of the ionic salt.
C
Both $$\mathrm{Sr}$$ and $$\mathrm{Be}$$ elements are present in the ionic salt.
D
The reaction is an example of acid - base neutralization reaction.
4
JEE Main 2023 (Online) 12th April Morning Shift
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
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The density of alkali metals is in the order :

A
$$\mathrm{Na}<\mathrm{K}<\mathrm{Cs}<\mathrm{Rb}$$
B
$$\mathrm{K}<\mathrm{Na}<\mathrm{Rb}<\mathrm{Cs}$$
C
$$\mathrm{K}<\mathrm{Cs}<\mathrm{Na}<\mathrm{Rb}$$
D
$$\mathrm{Na}<\mathrm{Rb}<\mathrm{K}<\mathrm{Cs}$$
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