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2021 JEE PYQ

Get chapter-wise JEE Main & Advanced questions with solutions

Q _JEE MAIN_2021
Let $y=y(x)$ be solution of the following differential equation $e^y \frac{d y}{d x}-2 e^y \sin x+\sin x \cos ^2 x=0, y\left(\frac{\pi}{2}\right)=0$. If $y(0)=\log _0\left(\alpha+\beta e^{-2}\right)$...
JEE Main Mathematics Easy
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Q JEE MAIN 2021
Methylation of 10 g of benzene gave 9.2 g of toluene. Calculate the percentage yield of toluene ______. (Nearest integer)
JEE Main Chemistry Easy
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Q JEE MAIN 2021
The total number of unpaired electrons present in $\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_6\right] \mathrm{Cl}_2$ and $\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_6\right] \mathrm{Cl}_3$ is
JEE Main Chemistry Easy
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Q _JEE MAIN_2021_
Let the foot of perpendicular from a point $P(1,2,-1)$ to the straight line $L: \frac{x}{1}=\frac{y}{0}=\frac{z}{-1}$ be $N$. Let a line be drawn from $P$ parallel...
JEE Main Mathematics Medium
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Q JEE MAIN 2021
The conditions given below are in the context of observing Tyndall effect in colloidal solutions:
(A) The diameter of the colloidal particles is comparable...
JEE Main Chemistry Easy
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Q JEE MAIN 2021
Let the acute angle bisector of the two planes x – 2y – 2z + 1 = 0 and 2x – 3y – 6z +...
JEE Main Mathematics Medium
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Q JEE MAIN 2021
Compound A is converted to B on reaction with $\mathrm{CHCl}_3$ and KOH . The compound B is toxic and can be decomposed by C.A, B...
JEE Main Chemistry Easy
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Q JEE MAIN 2021
The metal that can be purified economically by fractional distillation method is:
JEE Main Chemistry Medium
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Q JEE MAIN 2021 S2
Consider the system of linear equations $$ \begin{aligned} & -x+y+2 z=0 \\ & 3 x-a y+5 z=1 \\ & 2 x-2 y-a z=7 \end{aligned} $$...
JEE Main Mathematics Medium
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Q JEE MAIN 2021
In the given reaction 3-Bromo-2, 2 -dimethyl butane $\xrightarrow{\mathrm{C}_2 \mathrm{H}_5 \mathrm{OH}} \underset{\text { (Major Product) }}{'} A^{\prime}$ Product $A$ is:
JEE Main Chemistry Easy
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