List of top Questions asked in IIT JAM CY- 2026

The molecule that has ONLY one lone pair of electrons on xenon is _ _ _.

The $^1$H-NMR spectral data of a compound X is as follows: $\delta$ (ppm): 11.6 (s, 1H, exchangeable with D$_2$O), 7.60 (d, 1H, $J = 7.2$ Hz), 7.20 (t, 1H, $J = 7.2$ Hz), 6.90 (d, 1H, $J = 7.2$ Hz), 3.70 (s, 3H), 3.58 (s, 3H)Based on the spectral data, choose the appropriate structure for compound X.

Ellingham diagram is a plot of _ _ _.

The major product formed from the reaction between B$_2$H$_6$ and two equivalents of NH$_3$ at 300 $^\circ$C is _ _ _.

The metal that is used as a catalyst in the synthesis of (CH$_3$)$_2$SiCl$_2$ in Rochow-M\"uller process is _ _ _.

In DNA, the number of hydrogen bonds that hold each adenine-thymine base pair and each guanine-cytosine base pair, respectively, are _ _ _.

The correct relationship between the molecules X and Y is that, they are _ _ _.

The major product W formed in the following reaction is

The molecule that gets inter-converted into its enantiomer, upon ring flipping in its chair conformation, is _ _ _.

Given $C_p = a + bT$
$a = 19.5$, $b = 0.042$, $n = 1$ mole
Temperature changes from $27^\circ C$ to $327^\circ C$.
Find $\Delta H$.

T-shape geometry is shown by

Which of the following has tetrahedral coordination?

Compare the M–C bond length in the following complexes:
$Na_2[Mn(CO)_4]$, $Na[Mn(CO)_5]$, $Na[Mn(CO)_6]$.

Isothermal compressibility of an ideal gas \[ -\frac{1}{V}\left(\frac{dV}{dP}\right)_T \] is equal to

For the reaction: \[ N_2O_3(g) \rightarrow NO(g) + NO_2(g) \] If the degree of dissociation is $\alpha = 0.2$, find $\Delta n_g$ and total number of moles at equilibrium (starting with 1 mole).

Among the following compounds of Xenon, identify those having exactly one lone pair on Xenon:
$XeF_2$, $XeO_2F_2$, $XeO_3$, $XeO_3F_2$, $XeOF_2$.

Which of the following has the highest melting point?

The radioactive decay is given as: \[ {}^{238}_{92}U \rightarrow {}^{210}_{82}Pb + 7\alpha + x\beta^{-}. \] Find the value of $x$.

Langmuir isotherm

Write the van der Waals equation and explain the van der Waals isotherm (P–V curve).

Determine the shape of $ClF_3$ using VSEPR theory.

List the compounds of Xenon having one lone pair on the central atom.

Find the interplanar spacing $d_{hkl}$ (in Å) using Bragg’s law.
Given: $n = 1$, $\lambda = 1.54\,\text{Å}$
Use Bragg’s law: $n\lambda = 2d\sin\theta$.

Find the number of P–O–P (pyrophosphate) bonds present in $P_4O_8$.