JEE Main 2025 (Online) 22nd January Morning Shift
JEE Main / 25 questions
2026Wed, Jan 22, 2025 3:30 AM25 PYQs
1Aldehydes Ketones And Carboxylic Acids
The compounds which give positive Fehling's test are :
Choose the correct answer from the options given below :
Choose the correct answer from the options given below :
MCQ+4 / -12025
2Basics Of Organic Chemistry
In Carius method for estimation of halogens, 180 mg of an organic compound produced 143.5 mg of AgCl . The percentage composition of chlorine in the compound is _________ %. (Given : molar mass in $\mathrm{g} \mathrm{~mol}^{-1}$ of $\mathrm...
INTEGER+4 / -12025
3Basics Of Organic Chemistry
The incorrect statements regarding geometrical isomerism are :
(A) Propene shows geometrical isomerism.
(B) Trans isomer has identical atoms/groups on the opposite sides of the double bond.
(C) Cis-but-2-ene has higher dipole moment than tr...
(A) Propene shows geometrical isomerism.
(B) Trans isomer has identical atoms/groups on the opposite sides of the double bond.
(C) Cis-but-2-ene has higher dipole moment than tr...
MCQ+4 / -12025
4Basics Of Organic Chemistry
How many different stereoisomers are possible for the given molecule?
MCQ+4 / -12025
5Basics Of Organic Chemistry
The IUPAC name of the following compound is :
MCQ+4 / -12025
6Biomolecules
Which of the following acids is a vitamin ?
MCQ+4 / -12025
7Chemical Bonding And Molecular Structure
The number of molecules/ions that show linear geometry among the following is __________.
$\mathrm{SO}_2, \mathrm{BeCl}_2, \mathrm{CO}_2, \mathrm{~N}_3^{-}, \mathrm{NO}_2, \mathrm{~F}_2 \mathrm{O}, \mathrm{XeF}_2, \mathrm{NO}_2^{+}, \mathrm...
$\mathrm{SO}_2, \mathrm{BeCl}_2, \mathrm{CO}_2, \mathrm{~N}_3^{-}, \mathrm{NO}_2, \mathrm{~F}_2 \mathrm{O}, \mathrm{XeF}_2, \mathrm{NO}_2^{+}, \mathrm...
INTEGER+4 / -12025
8Chemical Equilibrium
A vessel at 1000 K contains $\mathrm{CO}_2$ with a pressure of 0.5 atm . Some of $\mathrm{CO}_2$ is converted into CO on addition of graphite. If total pressure at equilibrium is 0.8 atm , then Kp is :
MCQ+4 / -12025
9Chemical Kinetics And Nuclear Chemistry
$\mathrm{A \rightarrow B}$
The molecule A changes into its isomeric form B by following a first order kinetics at a temperature of 1000 K . If the energy barrier with respect to reactant energy for such isomeric transformation is $191.48 \m...
The molecule A changes into its isomeric form B by following a first order kinetics at a temperature of 1000 K . If the energy barrier with respect to reactant energy for such isomeric transformation is $191.48 \m...
INTEGER+4 / -12025
10Chemical Kinetics And Nuclear Chemistry
Which of the following statement is not true for radioactive decay?
MCQ+4 / -12025
11Compounds Containing Nitrogen
The products formed in the following reaction sequence are :
MCQ+4 / -12025
12Compounds Containing Nitrogen
Consider the following sequence of reactions :
Molar mass of the product formed $(\mathrm{A})$ is __________ $\mathrm{g} \mathrm{~mol}^{-1}$.
Molar mass of the product formed $(\mathrm{A})$ is __________ $\mathrm{g} \mathrm{~mol}^{-1}$.
INTEGER+4 / -12025
13Coordination Compounds
In which of the following complexes the CFSE, $\Delta_o$ will be equal to zero?
MCQ+4 / -12025
14Coordination Compounds
From the magnetic behaviour of $\left[\mathrm{NiCl}_4\right]^{2-}$ (paramagnetic) and $\left[\mathrm{Ni}(\mathrm{CO})_4\right]$ (diamagnetic), choose the correct geometry and oxidation state.
MCQ+4 / -12025
15D And F Block Elements
Lanthanoid ions with $4 \mathrm{f}^7$ configuration are :
(A) $\mathrm{Eu}^{2+}$
(B) $\mathrm{Gd}^{3+}$
(C) $\mathrm{Eu}^{3+}$
(D) $\mathrm{Tb}^{3+}$
(E) $ \mathrm{Sm}^{2+}$
Choose the correct answer from the options given below :
(A) $\mathrm{Eu}^{2+}$
(B) $\mathrm{Gd}^{3+}$
(C) $\mathrm{Eu}^{3+}$
(D) $\mathrm{Tb}^{3+}$
(E) $ \mathrm{Sm}^{2+}$
Choose the correct answer from the options given below :
MCQ+4 / -12025
16Electrochemistry
Which of the following electrolyte can be used to obtain $\mathrm{H}_2 \mathrm{~S}_2 \mathrm{O}_8$ by the process of electrolysis ?
MCQ+4 / -12025
17Electrochemistry
A solution of aluminium chloride is electrolysed for 30 minutes using a current of 2 A . The amount of the aluminium deposited at the cathode is __________ .
[Given : molar mass of aluminium and chlorine are $27 \mathrm{~g} \mathrm{~mol}^{-...
[Given : molar mass of aluminium and chlorine are $27 \mathrm{~g} \mathrm{~mol}^{-...
MCQ+4 / -12025
18Haloalkanes And Haloarenes
Given below are two statements :
Statement I : $\quad \mathrm{CH}_3-\mathrm{O}-\mathrm{CH}_2-\mathrm{Cl}$ will undergo $\mathrm{S}_{\mathrm{N}} 1$ reaction though it is a primary halide.
Statement II : will not undergo $\mathrm{S}_{\mathrm...
Statement I : $\quad \mathrm{CH}_3-\mathrm{O}-\mathrm{CH}_2-\mathrm{Cl}$ will undergo $\mathrm{S}_{\mathrm{N}} 1$ reaction though it is a primary halide.
Statement II : will not undergo $\mathrm{S}_{\mathrm...
MCQ+4 / -12025
19Hydrocarbons
Given below are two statements :
Statement I : One mole of propyne reacts with excess of sodium to liberate half a mole of $\mathrm{H}_2$ gas.
Statement II : Four g of propyne reacts with $\mathrm{NaNH}_2$ to liberate $\mathrm{NH}_3$ gas wh...
Statement I : One mole of propyne reacts with excess of sodium to liberate half a mole of $\mathrm{H}_2$ gas.
Statement II : Four g of propyne reacts with $\mathrm{NaNH}_2$ to liberate $\mathrm{NH}_3$ gas wh...
MCQ+4 / -12025
20Periodic Table And Periodicity
Which of the following electronegativity order is incorrect?
MCQ+4 / -12025
21Periodic Table And Periodicity
Match List-I with List-II.
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MCQ+4 / -12025
22Redox Reactions
Some $\mathrm{CO}_2$ gas was kept in a sealed container at a pressure of 1 atm and at 273 K . This entire amount of $\mathrm{CO}_2$ gas was later passed through an aqueous solution of $\mathrm{Ca}(\mathrm{OH})_2$. The excess unreacted $\mat...
INTEGER+4 / -12025
23Solutions
Arrange the following solutions in order of their increasing boiling points.
(i) $10^{-4} \mathrm{M} \mathrm{NaCl}$
(ii) $10^{-4} \mathrm{M}$ Urea
(iii) $10^{-3} \mathrm{M} \mathrm{NaCl}$
(iv) $10^{-2} \mathrm{M} \mathrm{NaCl}$
(i) $10^{-4} \mathrm{M} \mathrm{NaCl}$
(ii) $10^{-4} \mathrm{M}$ Urea
(iii) $10^{-3} \mathrm{M} \mathrm{NaCl}$
(iv) $10^{-2} \mathrm{M} \mathrm{NaCl}$
MCQ+4 / -12025
24Structure Of Atom
Radius of the first excited state of Helium ion is given as : $\mathrm{a}_0 \rightarrow$ radius of first stationary state of hydrogen atom.
MCQ+4 / -12025
25Thermodynamics
A liquid when kept inside a thermally insulated closed vessel at $25^{\circ} \mathrm{C}$ was mechanically stirred from outside. What will be the correct option for the following thermodynamic parameters ?
MCQ+4 / -12025