List of top Chemistry Questions asked in IIT JAM BT

Applying the Hückel rule, the number of aromatic compounds among the following is _ _ _. (in integer)

The standard enthalpy of formation of methane (\(CH_4\)), using the standard enthalpy of reaction values from the following reaction steps, is \(-x\) kcal/mol. The value of \(x\) is _ _ _. (round off to one decimal place)

If a weak acid \(HA\) is \(0.1\%\) ionized (dissociated) in a \(0.2M\) solution, its pH will be _ _ _. (round off to one decimal place)

The number of distinct products formed after the nitration of tetralone in the presence of \(HNO_3\) and \(H_2SO_4\) is _ _ _. (in integer)

The number of double bonds present in the isohypsic transformation product of allylic alcohol (Z) is _ _ _. (in integer)

Assuming atomic mass number of \(C=12\), \(N=14\), \(O=16\), \(H=1\), the molecular mass (in Daltons) of a tripeptide made up of only glycine amino acids is _ _ _. (in integer)

The volume of \(4M\) NaOH (in ml) required to make \(350\) ml solution of \(1.2M\) NaOH is _ _ _. (in integer)

In circular dichroism (CD) spectroscopy, the difference in molar extinction coefficients (\(\Delta \varepsilon\)) is plotted as a function of wavelength \(\lambda\) (in nm). In a CD spectrum of an alpha helical protein, \(\Delta \varepsilon\) will have a

Which of the following statements is/are true about phenoxide ions?

In the context of the nitrogen cycle in plants, identify the correct match between the nitrogen compound and the oxidation state of nitrogen

The correct relation between equilibrium constants, \(K_c\) (forward direction) and \(K_c'\) (reverse direction) of the reaction given below, at the same temperature, is

The correct gas phase acidity order for alcohols \(FCH_2OH\), \(CH_3OH\), \(ClCH_2OH\) and \(BrCH_2OH\) is

The repulsive interaction between different types of electron pairs increases in the order of

Coenzyme A is a co-factor of vitamin

Which one of the following is the correct decreasing order for the magnitude of Electron Gain Enthalpy \((\Delta_{eg}H)\) for the elements given below?

The data provided in the table were obtained from the following reaction, carried out at 273 𝐾.
𝐴 + 𝐵 → 𝐶 

Initial concentration of [𝐴] 𝑚𝑜𝑙 $𝐿 ^{−1}$	Initial concentration of [𝐵] 𝑚𝑜𝑙$𝐿 ^{−1}$	Initial rate of formation of [𝐶] 𝑚𝑜𝑙 $𝐿^{−1} 𝑠 ^{−1}$
0.2	0.2	0.3
0.4	0.2	0.6
0.4	0.4	2.4

The order of the reaction with respect to 𝐴 is _________.

Ammonia is synthesized in the Haber process in the following reaction.
$𝑁_2 (𝑔) + 3𝐻_2 (𝑔) → 2𝑁𝐻_3(𝑔)$ 
The temperature above which the reaction becomes spontaneous is __________ 𝐾 (rounded off to one decimal place). 
($\bigtriangleup 𝐻^0 = −92.2 𝑘𝐽, \bigtriangleup 𝑆^0 = −199 𝐽𝐾^{ −1}$ )

A cylinder contains 50 𝐿 of an ideal gas at a pressure of 50 𝑎𝑡𝑚. Assuming that the temperature remains unchanged, the volume of the gas at 1 𝑎𝑡𝑚 is __________ 𝐿 (rounded off to the nearest integer).

Ionic character of the covalent bonds in the compounds Cl2, HCl, NaCl, NaF follows the order

One molecule of the protein myoglobin contains one atom of iron. A myoglobin sample was found to contain 0.34% iron. The molecular weight of myoglobin is _________ $𝑔 𝑚𝑜𝑙^{−1}$ (rounded off to the nearest integer).
(Use $55.9 𝑔 𝑚𝑜𝑙^{−1}$ as atomic mass of iron)

The number of peaks in the $^{1}H NMR$ spectrum of methoxymethane $(𝐶𝐻_3𝑂𝐶𝐻_3)$ is ________ .

The amount of agarose required to prepare 250 𝑚𝐿 of 0.8% agarose gel is _______ 𝑔𝑟𝑎𝑚𝑠 (rounded off to the nearest integer).

A wooden plant accumulates $10 𝑚𝑔 𝑘𝑔^{−1}$ of $^{14}C$ during its life span. A fossil of this plant was discovered and contains $2.5 𝑚𝑔 𝑘𝑔^{−1}$ of $^{14}C$. The age of this fossil at the time of discovery is years (rounded off to the nearest integer).
(Use 5730 years as half-life of $^{14}C$)

In the given molecule,

the number of chiral centers is _______.

Which of the following technique(s) can be used to determine the three - dimensional structure of an organic compound?