This chapter is currently out of syllabus
1
JEE Main 2023 (Online) 15th April Morning Shift
+4
-1
Out of Syllabus
Given below are two statements : One is labelled as Assertion A and the other is labelled as Reason R :

Assertion (A) : $\mathrm{BeCl}_{2}$ and $\mathrm{MgCl}_{2}$ produce characteristic flame

Reason (R) : The excitation energy is high in $\mathrm{BeCl}_{2}$ and $\mathrm{MgCl}_{2}$

In the light of the above statements, choose the correct answer from the options given below :
A
$\mathrm{(A)}$ is true but $(\mathrm{R})$ is false
B
Both (A) and $(\mathrm{R})$ are true and $(\mathrm{R})$ is the correct explanation of $(A)$
C
(A) is false but (R) is true
D
Both (A) and (R) are true but (R) is NOT the correct explanation of (A)
2
JEE Main 2023 (Online) 13th April Evening Shift
+4
-1
Out of Syllabus

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
$$\mathrm{BeO}+\mathrm{C}+\mathrm{F}_{2} \stackrel{\Delta}{\longrightarrow} \mathrm{BeF}_{2}$$
3
JEE Main 2023 (Online) 13th April Evening Shift
+4
-1
Out of Syllabus

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
$$\mathrm{NaCl}<\mathrm{NaF}<\mathrm{NaBr}<\mathrm{NaI}$$
4
JEE Main 2023 (Online) 13th April Morning Shift
+4
-1
Out of Syllabus

$$\mathrm{Be}(\mathrm{OH})_{2}$$ 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.
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