1
JEE Main 2023 (Online) 1st February Evening Shift
+4
-1

The starting material for convenient preparation of deuterated hydrogen peroxide ($$\mathrm{D_{2}O_{2}}$$) in

A
$$\mathrm{BaO_{2}}$$
B
2-ethylanthraquinol
C
$$\mathrm{BaO}$$
D
$$\mathrm{K_{2}S_{2}O_{8}}$$
2
JEE Main 2023 (Online) 1st February Morning Shift
+4
-1

Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R

Assertion A: Hydrogen is an environment friendly fuel.

Reason R: Atomic number of hydrogen is 1 and it is a very light element.

In the light of the above statements, choose the correct answer from the options given below

A
Both A and R are true but R is NOT the correct explanation of A
B
A is false but R is true
C
A is true but R is false
D
Both A and R are true and R is the correct explanation of A
3
JEE Main 2023 (Online) 31st January Evening Shift
+4
-1
The normal rain water is slightly acidic and its $\mathrm{pH}$ value is $5.6$ because of which one of the following ?
A
$\mathrm{N}_{2} \mathrm{O}_{5}+\mathrm{H}_{2} \mathrm{O} \rightarrow 2 \mathrm{HNO}_{3}$
B
$2 \mathrm{SO}_{2}+\mathrm{O}_{2}+2 \mathrm{H}_{2} \mathrm{O} \rightarrow 2 \mathrm{H}_{2} \mathrm{SO}_{4}$
C
$4 \mathrm{NO}_{2}+\mathrm{O}_{2}+2 \mathrm{H}_{2} \mathrm{O} \rightarrow 4 \mathrm{HNO}_{3}$
D
$\mathrm{CO}_{2}+\mathrm{H}_{2} \mathrm{O} \rightarrow \mathrm{H}_{2} \mathrm{CO}_{3}$
4
JEE Main 2023 (Online) 31st January Evening Shift
+4
-1

Given below are two statements :

Statement I : $\mathrm{H}_{2} \mathrm{O}_{2}$ is used in the synthesis of Cephalosporin

Statement II : $\mathrm{H}_{2} \mathrm{O}_{2}$ is used for the restoration of aerobic conditions to sewage wastes.

In the light of the above statements, choose the most appropriate answer from the options given below :

A
Statement $\mathbf{I}$ is incorrect but Statement $\mathbf{II}$ is correct
B
Statement $\mathbf{I}$ is correct but Statement $\mathbf{II}$ is incorrect
C
Both Statement $\mathbf{I}$ and Statement $\mathbf{II}$ are incorrect
D
Both Statement $\mathbf{I}$ and Statement $\mathbf{II}$ are correct
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Physics
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Modern Physics
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