JEE Main 2025 (Online) 23rd January Evening Shift

Given below are two statements :
Statement (I) : The boiling points of alcohols and phenols increase with increase in the number of C -atoms.
Statement (II) : The boiling points of alcohols and phenols are higher in comparison to other clas...

A compound ' $\mathrm{X}^{\prime}$ absorbs 2 moles of hydrogen and ' X ' upon oxidation with $\mathrm{KMnO}_4 \mid \mathrm{H}^{+}$ gives

The total number of $\sigma$ bonds present in the compound ' $X^{\prime}$ ' is __________.

Given below are two statements:
Consider the following reaction

Statement (I): In the case of formaldehyde is about 2280, due to small substituents, hydration is faster.
Statement (II) : In the case of trichloro acetaldehyde is about 200...

The $\alpha$-Helix and $\beta$ - Pleated sheet structures of protein are associated with its :

Consider the reaction
\(\mathrm{X}_2 \mathrm{Y}(\mathrm{~g}) \rightleftharpoons \mathrm{X}_2(\mathrm{~g})+\frac{1}{2} \mathrm{Y}_2(\mathrm{~g})\)
The equation representing correct relationship between the degree of dissociation (x) of $\mat...

Which of the following graphs most appropriately represents a zero order reaction?

Consider the following sequence of reactions.

Total number of $\mathrm{sp}^3$ hybridised carbon atoms in the major product C formed is _________.

Identify the coordination complexes in which the central metal ion has $\mathrm{d}^4$ configuration.
(A) $\left[\mathrm{FeO}_4\right]^{2-}$
(B) $\quad\left[\mathrm{Mn}(\mathrm{CN})_6\right]^{3-}$
(C) $\left[\mathrm{Fe}(\mathrm{CN})_6\right]...

Match List - I with List - II

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Consider the following reactions
$$\mathrm{K}_2 \mathrm{Cr}_2 \mathrm{O}_7 \xrightarrow[-\mathrm{H}_2 \mathrm{O}]{\mathrm{KOH}}[\mathrm{~A}] \xrightarrow[-\mathrm{H}_2 \mathrm{O}]{\mathrm{H}_2 \mathrm{SO}_4}[\mathrm{~B}]+\mathrm{K}_2 \mathr...

Standard electrode potentials for a few half cells are mentioned below :
$$\begin{aligned}
& \mathrm{E}_{\mathrm{Cu}^{2+} / \mathrm{Cu}}^{\circ}=0.34 \mathrm{~V}, \mathrm{E}_{\mathrm{Zn}^{2+} / \mathrm{Zn}}^{\circ}=-0.76 \mathrm{~V} \\
& \m...

Identify the products [A] and [B], respectively in the following reaction:

The ascending order of relative rate of solvolysis of following compounds is :

Match List - I with List - II

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pH of water is 7 at $25^{\circ} \mathrm{C}$. If water is heated to $80^{\circ} \mathrm{C}$., it's pH will :

Given below are the atomic numbers of some group 14 elements. The atomic number of the element with lowest melting point is :

Identify A, B and C in the given below reaction sequence

When a non-volatile solute is added to the solvent, the vapour pressure of the solvent decreases by 10 mm of Hg . The mole fraction of the solute in the solution is 0.2 . What would be the mole fraction of the solvent if decrease in vapour ...

Consider a binary solution of two volatile liquid components 1 and $2 . x_1$ and $y_1$ are the mole fractions of component 1 in liquid and vapour phase, respectively. The slope and intercept of the linear plot of $\frac{1}{x_1}$ vs $\frac{1...

0.01 mole of an organic compound $(X)$ containing $10 \%$ hydrogen, on complete combustion produced $0.9 \mathrm{~g} \mathrm{H}_2 \mathrm{O}$. Molar mass of $(\mathrm{X})$ is _________ $\mathrm{g} \mathrm{~mol}^{-1}$.

When 81.0 g of aluminium is allowed to react with 128.0 g of oxygen gas, the mass of aluminium oxide produced in grams is ________ . (Nearest integer)
Given :
Molar mass of Al is $27.0 \mathrm{~g} \mathrm{~mol}^{-1}$
Molar mass of O is $16....

Given below are two statements :
Statement (I) : For a given shell, the total number of allowed orbitals is given by $n^2$.
Statement (II) : For any subshell, the spatial orientation of the orbitals is given by $-l$ to $+l$ values including...

Given below are two statements about X-ray spectra of elements :
Statement (I) : A plot of $\sqrt{v}$ ( $v=$ frequency of X-rays emitted) vs atomic mass is a straight line.
Statement (II) : A plot of $v(\nu=$ frequency of $X$-rays emitted) ...

The effect of temperature on spontaneity of reactions are represented as :

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The bond dissociation enthalpy of $\mathrm{X}_2 \Delta \mathrm{H}_{\text {bond }}^{\circ}$ calculated from the given data is ___________ $\mathrm{kJ} \mathrm{mol}^{-1}$. (Nearest integer)
$$\begin{aligned}
& \mathrm{M}^{+} \mathrm{X}^{-}(\m...