List of top Questions asked in JEE Main- 2025

What is the freezing point depression constant of a solvent, 50 g of which contain 1 g non-volatile solute (molar mass 256 g mol$^{-1}$) and the decrease in freezing point is 0.40 K?

Ice and water are placed in a closed container at a pressure of 1 atm and temperature 273.15K. If pressure of the system is increased 2 times, keeping temperature constant, then identify correct observation from the following:

For a given reaction $ R \rightarrow P $, $ t_{1/2} $ is related to $[A_0]$ as given in the table. Given: $ \log 2 = 0.30 $. Which of the following is true?

\[ \begin{array}{|c|c|} \hline \textbf{[A] (mol/L)} & \textbf{t$_{1/2}$ (min)} \\ \hline 0.100 & 200 \\ 0.025 & 100 \\ \hline \end{array} \]

The standard reduction potential values of some of the p-block ions are given below. Predict the one with the strongest oxidising capacity.

Match List - I with List - II: List - I: (A) Amylase
(B) Cellulose
(C) Glycogen
(D) Amylopectin
List - II: (I) $ \beta $-C1-C4 plant
(II) $ \alpha $-C1-C4 animal
(III) $ \alpha $-C1-C4 $ \alpha $-C1-C6 plant
(IV) $ \alpha $-C1-C4 plant
Choose the correct answer from the options given below:

1.24 g of $ {AX}_2 $ (molar mass 124 g mol$^{-1}$) is dissolved in 1 kg of water to form a solution with boiling point of 100.105$^\circ$C, while 2.54 g of $ {AY}_2 $ (molar mass 250 g mol$^{-1}$) in 2 kg of water constitutes a solution with a boiling point of 100.026$^\circ$C. $ K_{b(H_2O)} = 0.52 \, \text{K kg mol}^{-1} $. Which of the following is correct?

The correct option with order of melting points of the pairs (Mn, Fe), (Tc, Ru) and (Re, Os) is:

Choose the correct statements.
(A) Weight of a substance is the amount of matter present in it.
(B) Mass is the force exerted by gravity on an object.
(C) Volume is the amount of space occupied by a substance.
(D) Temperatures below $0^\circ$C are possible in Celsius scale, but in Kelvin scale negative temperature is not possible.
(E) Precision refers to the closeness of various measurements for the same quantity.
Choose the correct answer from the options given below:

500 J of energy is transferred as heat to 0.5 mol of Argon gas at 298 K and 1.00 atm. The final temperature and the change in internal energy respectively are: Given $ R = 8.3 \, {J K}^{-1} \, {mol}^{-1} $ Choose the correct answer from the options given below:

In the given structure, number of $ sp $ and $ sp^2 $ hybridized carbon atoms present respectively are:

Match List - I with List - II. List - I (Partial Derivatives) $and$ List - II (Thermodynamic Quantity)

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

If \[ \text{C(diamond)} \rightarrow \text{C(graphite)} + X \, \text{kj mol}^{-1} \] \[ \text{C(diamond)} + \text{O}_2(g) \rightarrow \text{CO}(g) + Y \, \text{kj mol}^{-1} \] \[ \text{C(graphite)} + \text{O}_2(g) \rightarrow \text{CO}(g) + Z \, \text{kj mol}^{-1} \] At constant temperature. Then:

Match List - I with List - II.

Partial Derivatives Thermodynamic Quantity

Choose the correct answer from the options given below :

Which of the following statement(s) is correct for the adiabatic process?

The elemental composition of a compound is 54.2% C, 9.2% H, and 36.6% O. If the molar mass of the compound is 132 g/mol, the molecular formula of the compound is:

Match List - I with List - II.