1
JEE Main 2025 (Online) 23rd January Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

Heat treatment of muscular pain involves radiation of wavelength of about 900 nm . Which spectral line of H atom is suitable for this?

Given : Rydberg constant $\left.\mathrm{R}_{\mathrm{H}}=10^5 \mathrm{~cm}^{-1}, \mathrm{~h}=6.6 \times 10^{-34} \mathrm{~J} \mathrm{~s}, \mathrm{c}=3 \times 10^8 \mathrm{~m} / \mathrm{s}\right)$

A
Lyman series, $\infty \rightarrow 1$
B
Balmer series, $\infty \rightarrow 2$
C
Paschen series, $5 \rightarrow 3$
D
Paschen series, $\infty \rightarrow 3$
2
JEE Main 2025 (Online) 23rd January Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

Which among the following react with Hinsberg's reagent?

A. JEE Main 2025 (Online) 23rd January Morning Shift Chemistry - Compounds Containing Nitrogen Question 13 English 1

B. JEE Main 2025 (Online) 23rd January Morning Shift Chemistry - Compounds Containing Nitrogen Question 13 English 2

$\text { C. } \mathrm{CH}_3-\mathrm{NH}_2$

D. $\mathrm{N}\left(\mathrm{CH}_3\right)_3$

E. JEE Main 2025 (Online) 23rd January Morning Shift Chemistry - Compounds Containing Nitrogen Question 13 English 3

Choose the correct answer from the options given below :

A
A, C and E only
B
A, B and E only
C
C and D only
D
B and D only
3
JEE Main 2025 (Online) 23rd January Morning Shift
Numerical
+4
-1
Change Language

For the thermal decomposition of $\mathrm{N}_2 \mathrm{O}_5(\mathrm{~g})$ at constant volume, the following table can be formed, for the reaction mentioned below.

$$2 \mathrm{~N}_2 \mathrm{O}_5(\mathrm{~g}) \rightarrow 2 \mathrm{~N}_2 \mathrm{O}_4(\mathrm{~g})+\mathrm{O}_2(\mathrm{~g})$$

Sr. No. Time/s Total pressure/(atm)
1 0 0.6
2 100 '$\mathrm{x}$'

$\mathrm{x}=$ __________ $\times 10^{-3} \mathrm{~atm}$ [nearest integer]

Given : Rate constant for the reaction is $4.606 \times 10^{-2} \mathrm{~s}^{-1}$.

Your input ____
4
JEE Main 2025 (Online) 23rd January Morning Shift
Numerical
+4
-1
Change Language

The standard enthalpy and standard entropy of decomposition of $\mathrm{N}_2 \mathrm{O}_4$ to $\mathrm{NO}_2$ are $55.0 \mathrm{~kJ} \mathrm{~mol}^{-1}$ and $175.0 \mathrm{~J} / \mathrm{K} / \mathrm{mol}$ respectively. The standard free energy change for this reaction at $25^{\circ} \mathrm{C}$ in J $\mathrm{mol}^{-1}$ is ________ (Nearest integer)

Your input ____
JEE Main Papers
2023
2021
EXAM MAP