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2021 JEE PYQ

Get chapter-wise JEE Main & Advanced questions with solutions

Q JEE MAIN 2021
100 g of propane is completely reacted with 1000 g of oxygen. The mole fraction of carbon dioxide in the resulting mixture is $...
JEE Main Chemistry Easy
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Q JEE MAIN 2019
The stream of a river is flowing with a speed of 2 km/h. A swimmer can swim at a speed of 4 km/h. What should...
JEE Main Physics Easy
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Q JEE MAIN 2021
In which one of the following sets all species show disproportionation reaction ?
JEE Main Chemistry Easy
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Q JEE MAIN 2021
Two flasks I and II shown below are connected by a valve of negligible volume. When the valve is opened, the final pressure of the...
JEE Main Chemistry Medium
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Q JEE MAIN 2019
A stationary horizontal disc is free to rotate about its axis. When a torque is applied on it, its kinetic energy as a function of...
JEE Main Physics Medium
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Q JEE-MAIN 2021
A chloro compound "A".
(i) forms aldehydes on ozonolysis followed by the hydrolysis.
(ii) when vaporized completely 1.53 g of A, gives 448 mL of...
JEE Main Chemistry Easy
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Q JEE MAIN 2021
The reaction rate for the reaction| $$ \left[\mathrm{PtCl}_4\right]^{2-}+\mathrm{H}_2 \mathrm{O} \rightleftharpoons\left[\mathrm{Pt}\left(\mathrm{H}_2 \mathrm{O}\right) \mathrm{Cl}_3\right]^{-}+\mathrm{Cl}^{-} $$ was measured as a function of concentrations of different species. It was...
JEE Main Chemistry Easy
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Q JEE MAIN 2021
The number of optical isomers possible for $\left[\mathrm{Cr}\left(\mathrm{C}_2 \mathrm{O}_4\right)_3\right]^{3-}$ is
JEE Main Chemistry Easy
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Q JEE MAIN 2019
The magnetic field of a plane electromagnetic wave is given by :
$\overrightarrow{\mathrm{B}}=\overrightarrow{\mathrm{B}}_0 \hat{\mathrm{i}}\left[\cos (\mathrm{kz}-\omega \mathrm{t})+\mathrm{B}_1 \hat{\mathrm{j}} \cos (\mathrm{kz}+\omega \mathrm{t})\right.$
where $...
JEE Main Physics Medium
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Q JEE MAIN 2021
SECTION-B The first order rate constant for the decomposition of $\mathrm{CaCO}_3$ at 700 K is $6.36 \times 10^{-3} \mathrm{~s}^{-1}$ and activation energy is $...
JEE Main Chemistry Medium
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