List of top Questions asked in IIT JAM CY- 2026

At a constant pressure, the entropy of mixing of 1 mole of oxygen with 3 moles of nitrogen at 25 $^\circ$C is _ _ _ J K$^{-1}$. (rounded off to two decimal places)

The rotational spectrum of HF has equally spaced lines that are 40.9 cm$^{-1}$ apartThe moment of inertia of HF is $Y \times 10^{-47}$ kg m$^2$The value of Y is _ _ _. (rounded off to three decimal places)

A free particle of mass $m$ confined within the walls of a one-dimensional box of length $a$ (with the potential outside the box being infinity), is in the eigenstate having quantum number $n = 4$The magnitude of uncertainty in the measurement of momentum of the particle is $Y \times \frac{h}{a}$The value of $Y$ is _ _ _. (answer in integer)

If the radial wavefunction of the 3p orbital of a hydrogen-like atom is

The mobility of Na$^+$ ions in water at 298 K is $5.19 \times 10^{-8}$ m$^2$ s$^{-1}$ V$^{-1}$If the effective radius of a Na$^+$ ion is $Y \times 10^{-12}$ m, the value of $Y$ is _ _ _. (rounded off to two decimal places)

At pH 7, the reaction for the oxidation of NADH at 298 K and a pressure of 1 atm is given below:

For the dissociation reaction,

The total number of P–O–P bridge(s) in the solid state structure of P$_4$O$_8$ is _ _ _. (answer in integer)

The number of iron atom(s) in Fe$_3$O$_4$ with an oxidation state of III along with a coordination number of six is _ _ _. (answer in integer)

The specific rotation $[\alpha]_D^{25}$ of (S)-2-pentanol is +13.0 degreesA one molar solution of (S)-2-pentanol is mixed with an equal volume of one molar solution of racemic 2-pentanolThe observed rotation, $\alpha$, of the resulting solution, when measured in a polarimeter tube of path length 10 cm is _ _ _ degrees. (rounded off to three decimal places)

When 3.00 g of a substance of molar mass 250 g mol$^{-1}$ is dissolved in 100 g of CCl$_4$, the boiling point of the solvent (CCl$_4$) will be elevated by _ _ _ K. (rounded off to two decimal places)

Consider the following radioactive decay process

The Debye temperatures ($\theta_D$) of diamond and copper are 2230 K and 343 K, respectivelyThe maximum value of the frequency of the atomic oscillations of diamond is Y times the maximum value of the frequency of the atomic oscillations of copperThe value of Y is _ _ _. (rounded off to two decimal places)

At 30$^\circ$C, the half-life for the decomposition of a compound is 100 seconds and the value of the half-life is independent of the initial concentration of the reactantThe time required for 30\% of the reactant to be consumed is _ _ _ seconds. (rounded off to one decimal place)

A system consists of 110 particlesEach particle can have only two non-degenerate energy states $\epsilon_1$ and $\epsilon_2$ with $\epsilon_2 > \epsilon_1$The energy difference between these two states is 0.10 eVThe temperature at which only 10 particles of the system will be present in the energy state $\epsilon_2$ is _ _ _ K. (rounded off to two decimal places)

The number of normal modes of vibration in benzene is _ _ _. (answer in integer)

For the equation $y = 3x^5 + 4x^4 - 3x^3 + x^2 - 2x + 1$, the value of $\frac{d^5y}{dx^5}$ is _ _ _. (answer in integer)

The Langmuir isotherm for the adsorption of a gas on a solid surface can be expressed as $\theta = \frac{Kp}{1+Kp}$The correct statement(s) about this isotherm is/are

The number of stereogenic centre(s) present in the given alkaloid is _ _ _. (answer in integer)

The type(s) of chemically non-equivalent protons present in the following molecule is _ _ _. (answer in integer)

The number of unpaired electron(s) of chromium in [($\eta^6$-C$_6$H$_6$)Cr(CO)$_3$] is _ _ _. (answer in integer)

Choose the correct statement(s) with regard to the complexometric titration of [Ni(H$_2$O)$_6$]$^{2+}$ ion with a complexing agent Na$_2$H$_2$EDTA, using a suitable indicator under basic conditions.

The correct statement(s) for graphite is/are

Choose the correct statement(s) with regard to the terpenes given below.

The reactions of Li, Na and K with an excess of oxygen results in the formation of X, Y and Z respectively, as major productsThe correct option(s) is/are