List of top Questions asked in IIT JAM CY

The spin-only magnetic moment of B₂ molecule is_____ μ_𝐵 .
(round off to two decimal places)

The correct statement(s) about the complexes I (K3[CoF₆]) and II (K₃[RhF₆]) is/are

The correct statement(s) is/are

The diatomic molecule(s) that has/have bond order of one is/are

The sum of the total number of stereoisomers (including enantiomers) present in the following molecules is _____.

The geometry of [VO(acac)₂] is

For the given elementary reactions, the steady-state concentration of X is

The isoelectric point of glutamic acid is ______.

(round off to two decimal places)

Free heme in aqueous solution when exposed to dioxygen is finally converted to (circle around iron in the given choices represents the protoporphyrin IX)

The standard reduction potential (E⁰ ) of Fe³⁺→Fe is____V.
[Given: Fe³⁺→Fe2+ E ⁰ = 0.77 V and 
Fe²⁺→Fe E ⁰=−0.44 V] 
(round off to three decimal places)

The spin-only magnetic moment of [Fe(acac)₃] is____μ𝐵 .
(round off to two decimal places)

In a gravimetric estimation of Al, a sample of 0.1000 g AlCl₃ is precipitated with 8-hydroxyquinoline. The weight of the precipitate is _____ g.
[Given: atomic weight of Al is 26.98; molecular weight of AlCl₃ is 133.34; and molecular weight of 8-hydroxyquinoline is 145.16] 
(round off to 4 decimal places)

The products X and Y in the following reaction sequence, respectively, are

When a glass capillary tube is dipped in water, a 1.0 cm rise in the water level is observed at 18 °C. The internal radius of the capillary is ______ cm.
[Given: Surface tension of water at 18 °C = 73.2 dyne cm⁻¹ ; difference in the densities of water and air at 18 °C = 0.996 g cm⁻³ ; gravitational acceleration constant, g = 980 cm s⁻² .
Assume that water completely wets the glass capillary and the interface between the water and the air phase inside the capillary is a hemisphere.] (round off to two decimal places)

The molecule(s) that follow(s) 𝐼_𝑎< 𝐼_𝑏=𝐼𝑐 (𝐼_𝑎, 𝐼_𝑏, and 𝐼_𝑐 are the principal moments of inertia) is/are

The reaction(s) that yield(s) 1-naphthol as the major product is/are

The role(s) of fluorspar in the electrolytic reduction of Al₂O₃ is/are to

The reaction(s) that yield(s) Ph-CH₂-CH₂-CO₂ Me as the major product is/are

The number of singlets observed in the 1H NMR spectrum of P is ____.

X and Y in the following reactions, respectively, are

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

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

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 _______.