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2021 JEE PYQ

Get chapter-wise JEE Main & Advanced questions with solutions

Q JEE MAIN 2021
The ratio of number of water molecules in Mohr's salt and potash alum is $\_\_\_\_$ $\times 10^{-1}$. (Integer answer)
JEE Main Chemistry Easy
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Q JEE MAIN 2021
The number of 4f electrons in the ground state electronic configuration of Gd2+ is ________.
[Atomic number of Gd = 64]
JEE Main Chemistry Easy
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Q JEE MAIN 2021
The $\mathrm{OH}^{-}$concentration in a mixture of 5.0 mL of $0.0504 \mathrm{M} \mathrm{NH}_4 \mathrm{Cl}$ and 2 mL of $0.0210 \mathrm{MNH}_3$ solution is $\mathrm{x} \times 10^{-6} \mathrm{M}$....
JEE Main Chemistry Medium
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Q JEE MAIN 2021
Of the following four aqueous solutions, total number of those solutions whose freezing point is lower than that of $0.10 \mathrm{M} \mathrm{C}_2 \mathrm{H}_5 \mathrm{OH}$ is...
JEE Main Chemistry Easy
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Q JEE MAIN 2021
These are physical properties of an element
(A) Sublimation enthalpy (B) Ionisation enthalpy
(C) Hydration enthalpy (D) Electron gain enthalpy
The total number of...
JEE Main Chemistry Hard
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Q JEE MAIN 2021
$\mathrm{AB}_3$ is an interhalogen T-shaped molecule. The number of lone pairs of electrons on A is $\_\_\_\_$ (Integer answer)
JEE Main Chemistry Easy
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Q JEE Main 2021
If $\frac{d y}{d x}=\frac{2^x y+2^y \cdot 2^x}{2^x+2^{x+y} \log _e 2}, y(0)$, then for $y=1$, the value of $x$ lies in the interval :
JEE Main Mathematics Easy
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Q JEE Main 2021
The locus of mid-points of the line segments joining $(-3,-5)$ and the points on the ellipse $\frac{x^2}{4}+\frac{y^2}{9}=1$ is :
JEE Main Mathematics Medium
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Q JEE MAIN 2021
Three numbers are in an increasing geometric progression with common ratio $r$. If the middle number is doubled, then the new numbers are in an...
JEE Main Mathematics Medium
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Q JEE Main 2021
If $\alpha=\lim _{x \rightarrow \pi / 4} \frac{\tan ^3 x-\tan x}{\cos \left(x+\frac{\pi}{4}\right)}$ and $\beta=\lim _{x \rightarrow 0}(\cos x)^{\cot x}$ are the roots of the equation,...
JEE Main Mathematics Medium
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