JEE Main 2023 (Online) 1st February Morning Shift | Hydrogen Question 11 | Chemistry

This chapter is currently out of syllabus

JEE Main 2023 (Online) 1st February Morning Shift

MCQ (Single Correct Answer)

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Out of Syllabus

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)

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Out of Syllabus

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)

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Out of Syllabus

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

JEE Main 2023 (Online) 31st January Morning Shift

MCQ (Single Correct Answer)

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Out of Syllabus

$$\mathrm{H}_{2} \mathrm{O}_{2}$$ acts as a reducing agent in :

$$\mathrm{Mn}^{2+}+2 \mathrm{H}_{2} \mathrm{O}_{2} \rightarrow \mathrm{MnO}_{2}+2 \mathrm{H}_{2} \mathrm{O}$$

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

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

$$2 \mathrm{NaOCl}+\mathrm{H}_{2} \mathrm{O}_{2} \rightarrow 2 \mathrm{NaCl}+\mathrm{H}_{2} \mathrm{O}+\mathrm{O}_{2}$$

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