List of top Questions asked in IIT JAM CY- 2022

The reaction of 2,4-dinitrofluorobenzene with hydrazine produces a yellow orange solid X used for the identification of an organic functional group G. X and G, respectively, are

The ratio of the $2p → 1s$ transition energy in $He^+$ to that in the H atom is closest to

Two close lying bands in a UV spectrum occur at 274 nm and 269 nm. The magnitude of the energy gap between the two bands is ____cm^-1. (round off to the nearest integer)

At constant temperature, 6.40 g of a substance dissolved in 78 g of benzene decreases the vapor pressure of benzene from 0.125 atm to 0.119 atm. The molar mass of the substance is ____g mol^-1. (round off to one decimal place)
[Given: Mol. wt. of benzene = 78 g mol^-1]

The number of $\beta$ particles emitted in the nuclear reaction $^{238}U_{92} → ^{206}Pb_{82}$ is _______.

The number of significant figures in $5.0820 x 10^2$ is _________.

The pH of an aqueous buffer prepared using CH3COOH and CH3COO Na⁺ is 4.80.
The quantity $\frac{[CH_3COO^-]-[CH_3COOH]}{[CH_3COOH]}$ is _____. (round off to three decimal places)
[Given: pK_a of CH₃COOH in water is 4.75]

The d spacing for the first-order X-ray ($\lambda$= 1.54 Å) diffraction event of metallic iron (fcc) at $2\theta= 20.2°$ is _______.Å. (round off to three decimal places)

The B-B bond order in $B_2$ is ______.

An organic compound having molecular formula $C_9H_{10}O_2$ exhibits the following spectral characteristics:
$'H NMR: \delta 9.72 (t, 1H), 7.1 (d, 2H), 6.7 (d, 2H), 3.8 (s, 3H), 3.6 (d, 2H)$
$IR: ~1720 cm^{-1}$
The most probable structure of the compound is

The compound(s) that participate(s) in Diels-Alder reaction with maleic anhydride is/are

steady current of 1.25 A is passed through an electrochemical cell for 1.5 h using a 12 V battery. The total charge, Q, drawn during this process is __________ Coulombs. (round off to the nearest integer)

Among the following, the suitable route(s) for the conversion of benzaldehyde to acetophenone is/are

The common point defect(s) in a solid is/are

The major product formed in the following reaction is

The conversion of $ICl$ to $ICl^+$ involve(s)

The correct statement about the geometries of $BH_2^+$ and $NH_2^+$ , based on valence shell electron pair repulsion (VSEPR) theory is

The Maxwell-Boltzmann distribution $f(v_x)$ of one-dimensional velocities $v_x$ at temperature T is [Given: A is a normalization constant such that $\int_{-\infty}^{\infty} f(v_x) dv_x = 1$, and $k_B$ is the Boltzmann constant]

All possible lattice types are observed in the

The ground state and the maximum number of spin-allowed electronic transitions possible in a $Co^{2+}$ tetrahedral complex, respectively, are

The number of signals observed in the $^1H NMR$ spectrum of the compound

is _________.

Among of the following

the number of aromatic compounds is _______ .

Among the following, the correct statement(s) is/are:

Capillary W contains water and capillary M contains mercury. The contact angles between the capillary wall and the edge of the meniscus at the air-liquid interface in $W$ and $M$ are $\theta_W$ and $\theta_M$, respectively. The contact angles satisfy the conditions

The number of CO stretching bands in the infrared spectrum of $Fe(CO)_5$ is