JEE Main 2023 (Online) 1st February Evening Shift

MCQ (Single Correct Answer)

-1

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

$$\mathrm{BaO_{2}}$$

2-ethylanthraquinol

$$\mathrm{BaO}$$

$$\mathrm{K_{2}S_{2}O_{8}}$$

JEE Main 2023 (Online) 1st February Morning Shift

MCQ (Single Correct Answer)

-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

Both A and R are true but R is NOT the correct explanation of A

A is false but R is true

A is true but R is false

Both A and R are true and R is the correct explanation of A

JEE Main 2023 (Online) 31st January Evening Shift

MCQ (Single Correct Answer)

-1

The normal rain water is slightly acidic and its $\mathrm{pH}$ value is $5.6$ because of which one of the following ?

$\mathrm{N}_{2} \mathrm{O}_{5}+\mathrm{H}_{2} \mathrm{O} \rightarrow 2 \mathrm{HNO}_{3}$

$2 \mathrm{SO}_{2}+\mathrm{O}_{2}+2 \mathrm{H}_{2} \mathrm{O} \rightarrow 2 \mathrm{H}_{2} \mathrm{SO}_{4}$

$4 \mathrm{NO}_{2}+\mathrm{O}_{2}+2 \mathrm{H}_{2} \mathrm{O} \rightarrow 4 \mathrm{HNO}_{3}$

$\mathrm{CO}_{2}+\mathrm{H}_{2} \mathrm{O} \rightarrow \mathrm{H}_{2} \mathrm{CO}_{3}$

JEE Main 2023 (Online) 31st January Evening Shift

MCQ (Single Correct Answer)

-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 :

Statement $\mathbf{I}$ is incorrect but Statement $\mathbf{II}$ is correct

Statement $\mathbf{I}$ is correct but Statement $\mathbf{II}$ is incorrect

Both Statement $\mathbf{I}$ and Statement $\mathbf{II}$ are incorrect

Both Statement $\mathbf{I}$ and Statement $\mathbf{II}$ are correct

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