1
JEE Main 2026 (Online) 24th January Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

Consider the following gaseous equilibrium in a closed container of volume ' $V$ ' at $\mathrm{T}(\mathrm{K})$.

$$ \mathrm{P}_2(\mathrm{~g})+\mathrm{Q}_2(\mathrm{~g}) \rightleftharpoons 2 \mathrm{PQ}(\mathrm{~g}) $$

2 moles each of $\mathrm{P}_2(\mathrm{~g}), \mathrm{Q}_2(\mathrm{~g})$ and $\mathrm{PQ}(\mathrm{g})$ are present at equilibrium. Now one mole each of ' $\mathrm{P}_2$ ' and ' $\mathrm{Q}_2$ ' are added to the equilibrium keeping the temperature at $\mathrm{T}(\mathrm{K})$. The number of moles of $\mathrm{P}_2, \mathrm{Q}_2$ and PQ at the new equilibrium, respectively, are

A

$2.56,1.62,2.24$

B

$2.67,2.67,2.67$

C

1.21, 2.24, 1.56

D

$1.66,1.66,1.66$

2
JEE Main 2026 (Online) 24th January Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

The correct order of $\mathrm{C}, \mathrm{N}, \mathrm{O}$ and F in terms of second ionisation potential is

A

$\mathrm{C}<\mathrm{N}<\mathrm{F}<\mathrm{O}$

B

$\mathrm{C}<\mathrm{F}<\mathrm{N}<\mathrm{O}$

C

$\mathrm{F}<\mathrm{N}<\mathrm{C}<\mathrm{O}$

D

$\mathrm{C}<\mathrm{O}<\mathrm{N}<\mathrm{F}$

3
JEE Main 2026 (Online) 24th January Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

Given below are two statements :

Statement I : Cross aldol condensation between two different aldehydes will always produce four different products.

Statement II : When semicarbazide reacts with a mixture of benzaldehyde and acetophenone under optimum pH , it forms a condensation product with acetophenone only.

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

A

Statement I is true but Statement II is false

B

Both Statement I and Statement II are false

C

Both Statement I and Statement II are true

D

Statement I is false but Statement II is true

4
JEE Main 2026 (Online) 24th January Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

Choose the INCORRECT statement

A

Carbon exhibits negative oxidation states along with +4 and +2 .

B

Carbon cannot exceed its covalency more than four.

C

Among the isotopes of carbon, ${ }^{13} \mathrm{C}$ is a radioactive isotope.

D

$\mathrm{CO}_2$ is the most acidic oxide among the dioxides of group of 14 elements.

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