1
JEE Main 2025 (Online) 3rd April Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language
Which of the following postulate of Bohr's model of hydrogen atom is not in agreement with quantum mechanical model of an atom?
A
The electron in a H atom's stationary state moves in a circle around the nucleus.
B
An atom can take only certain distinct energies $\mathrm{E}_1, \mathrm{E}_2, \mathrm{E}_3$, etc. These allowed states of constant energy are called the stationary states of atom.
C
An atom in a stationary state does not emit electromagnetic radiation as long as it stays in the same state.
D
When an electron makes a transition from a higher energy stationary state to a lower energy stationary state, then it emits a photon of light.
2
JEE Main 2025 (Online) 3rd April Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language
In the following system, $\mathrm{PCl}_5(\mathrm{~g}) \leftrightharpoons \mathrm{PCl}_3(\mathrm{~g})+\mathrm{Cl}_2(\mathrm{~g})$ at equilibrium, upon addition of xenon gas at constant T \& p , the concentration of
A
$\mathrm{PCl}_5, \mathrm{PCl}_3 \& \mathrm{Cl}_2$ remain constant
B
$\mathrm{PCl}_3$ will increase
C
$\mathrm{Cl}_2$ will decrease
D
$\mathrm{PCl}_5$ will increase
3
JEE Main 2025 (Online) 3rd April Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

$$ \text { In the following reactions, which one is NOT correct? } $$

A
JEE Main 2025 (Online) 3rd April Morning Shift Chemistry - Compounds Containing Nitrogen Question 3 English Option 1
B
JEE Main 2025 (Online) 3rd April Morning Shift Chemistry - Compounds Containing Nitrogen Question 3 English Option 2
C
JEE Main 2025 (Online) 3rd April Morning Shift Chemistry - Compounds Containing Nitrogen Question 3 English Option 3
D
JEE Main 2025 (Online) 3rd April Morning Shift Chemistry - Compounds Containing Nitrogen Question 3 English Option 4
4
JEE Main 2025 (Online) 3rd April Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

Given below are two statements :

Statement I : The N - N single bond is weaker and longer than that of P - P single bond.

Statement II : Compounds of group 15 elements in +3 oxidation states readily undergo disproportionation reactions.

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

A
Statement I is false but Statement II is true
B
Both Statement I and Statement II are true
C
Both Statement I and Statement II are false
D
Statement I is true but Statement II is false
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