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2021 JEE PYQ

Get chapter-wise JEE Main & Advanced questions with solutions

Q JEE-MAIN 2021
A metal surface is exposed to 500 nm radiation. The threshold frequency of the metal for photoelectric current is $4.3 \times 10^{14} \mathrm{~Hz}$. The velocity...
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Q JEE MAIN 2021
Hydrolysis of sucrose gives
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Q JEE-MAIN 2021
For water $\Delta_{\text {vap }} \mathrm{H}=41 \mathrm{~kJ} \mathrm{~mol}^{-1}$ at 373 K and 1 bar pressure. Assuming that water vapour is an ideal gas that occupies...
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Q JEE MAIN 2021
For the reaction $\mathrm{A} \rightarrow \mathrm{B}$, the rate constant $\mathrm{k}\left(\right.$ in $\left.\mathrm{s}^{-1}\right)$ is given by
$$ \log _{10} k=20.35-\frac{\left(2.47 \times 10^3\right)}{T} $$
The energy of...
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Q JEE MAIN 2021
If the concentration of glucose $\left(\mathrm{C}_6 \mathrm{H}_{12} \mathrm{O}_6\right)$ in blood is 0.72 g $L^{-1}$, the molarity of glucose in blood is ______ × $10^{-3} \mathrm{M}$....
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Q JEE-MAIN 2021
The equilibrium constant Kc at 298 K for the reaction $\mathrm{A}+\mathrm{B} \rightleftharpoons \mathrm{C}+\mathrm{D}$ is 100 . Starting with an equimolar solution with concentrations of $...
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Q JEE MAIN 2021
In the above first order reaction the initial concentration of $\mathrm{N}_2 \mathrm{O}_5$ is $2.40 \times 10^{-2} \mathrm{~mol} \mathrm{~L}^{-1}$ at 318 K. The concentration of $...
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Q JEE MAIN 2021
The pH of a solution obtained by mixing 50 mL of 1 M HCl and 30 mL of 1 M NaOH is $x \times 10^{-4}$....
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Q JEE MAIN 2021
Which one of the following tests used for the identification of functional groups in organic compounds does not use copper reagent ?
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Q JEE MAIN 2021
Number of electrons that Vanadium (Z = 23) has in p-orbitals is equal to ______
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