NEET (UG) 2025 Chemistry Medium Questions

Consider the following compounds: $K{O}_2$, $H_2{O}_2$ and $H_{2}S{O}_4$. The oxidation states of the underlined elements in them are, respectively:

For the reaction $\mathrm{A}(\mathrm{g})\rightleftharpoons 2\mathrm{B}(\mathrm{g})$, the backward reaction rate constant is higher than the forward reaction rate constant by a factor of 2500 at $1000\mathrm{K}$. $K_p$ for the reaction at $1000\mathrm{K}$ is [Given: $R=0.0831\mathrm{L}\mathrm{atm}\mathrm{mo}{\mathrm{l}}^{-1}{\mathrm{K}}^{-1}$]

If the rate constant of a reaction is $0.03{\mathrm{s}}^{-1}$, how much time does it take for $7.2\mathrm{mol}{\mathrm{L}}^{-1}$ concentration of the reactant to get reduced to $0.9\mathrm{mol}{\mathrm{L}}^{-1}$?
(Given: $\log 2=0.301$)

Identify the suitable reagent for the following conversion

Energy and radius of first Bohr orbit of $\mathrm{H}{\mathrm{e}}^{+}$ and $\mathrm{L}{\mathrm{i}}^{2+}$ are given. [$R_H=2.18\times 10^{-18}\mathrm{J}$, $a_0=52.9\mathrm{pm}$]. Choose the correct set:

The ratio of the wavelengths of the light absorbed by a Hydrogen atom when it undergoes $n=2\to n=3$ and $n=4\to n=6$ transitions, respectively, is

Match List-I with List-II.

List-I
A. Haber process
B. Wacker oxidation
C. Wilkinson catalyst
D. Ziegler catalyst

List-II
I. Fe catalyst
II. $\mathrm{PdC}{\mathrm{l}}_2$ III. $[(\mathrm{PP}{\mathrm{h}}_3{)}_3\mathrm{RhCl}]$ IV. $\mathrm{TiC}{\mathrm{l}}_4$ with $\mathrm{Al}(\mathrm{C}{\mathrm{H}}_3{)}_3$

Choose the correct answer from the options given below:

Out of the following complex compounds, which of the compound will be having the minimum conductance in solution?

If the half-life ($t_{1/2}$) for a first-order reaction is $1\text{minute}$, then the time required for $99.9\%$ completion of the reaction is closest to:

Which of the following aqueous solutions will exhibit the highest boiling point?

If the molar conductivity $\left({\Lambda }_m\right)$ of a $0.050\mathrm{mol}{\mathrm{L}}^{-1}$ solution of a monobasic weak acid is $90\mathrm{S}\mathrm{c}{\mathrm{m}}^2\mathrm{mo}{\mathrm{l}}^{-1}$, its extent (degree) of dissociation will be [Assume ${\lambda }_{{\mathrm{H}}^{+}}^0=349.6\mathrm{S}\mathrm{c}{\mathrm{m}}^2\mathrm{mo}{\mathrm{l}}^{-1}$ and ${\lambda }_{{\mathrm{A}}^{-}}^0=50.4\mathrm{S}\mathrm{c}{\mathrm{m}}^2\mathrm{mo}{\mathrm{l}}^{-1}$]

How many products (including stereoisomers) are expected from monochlorination of the following compound?

Match List I with List II.
List I (Name of Vitamin):
A. Vitamin ${\mathrm{B}}_{12}$ B. Vitamin D
C. Vitamin ${\mathrm{B}}_2$ D. Vitamin ${\mathrm{B}}_6$ List II (Deficiency disease):
I. Cheilosis
II. Convulsions
III. Rickets
IV. Pernicious anaemia
Choose the correct answer from the options given below:

Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R).

Assertion (A): $\mathrm{R}-\mathrm{I}$ undergoes ${\mathrm{S}}_{\mathrm{N}}2$ reaction faster than $\mathrm{R}-\mathrm{Cl}$.
Reason (R): Iodine is a better leaving group because of its large size.

Choose the correct answer:

The major product of the following reaction is

Which one of the following compounds can exist as cis-trans isomers?

Which one of the following reactions does NOT belong to "Lassaigne's test"?

Which one of the following reactions does NOT give benzene as the product?

Sugar 'X'
A. is found in honey.
B. is a keto sugar.
C. exists in $\alpha$ and $\beta$ - anomeric forms.
D. is laevorotatory.
'X' is:

Given below are two statements:
Statement I: Ferromagnetism is considered as an extreme form of paramagnetism.
Statement II: The number of unpaired electrons in a ${\text{Cr}}^{2+}$ ion ($Z=24$) is the same as that of a ${\text{Nd}}^{3+}$ ion ($Z=60$).
In the light of the above statements, choose the correct answer from the options given below: