List of top Questions asked in JEE Main- 2023

If gcd \( (m, n) = 1 \) and \[ 1^2 - 2^2 + 3^2 - 4^2 + \cdots + (2022)^2 - (2023)^2 = 1012 \, m^2 n \] then \( m^2 - n^2 \) is equal to:
Which one of the following elements will remain as liquid inside pure boiling water?

Ion having highest hydration enthalpy among the given alkaline earth metal ions is:

Two forces of magnitude A and \(\frac{A}{2}\) act perpendicular to each other. The magnitude of the resultant force is equal to:
Among the statements:
XeF$_4$ reacts with SbF$_5$ to form:
\[ [\text{XeF}_m]^{n+}[\text{SbF}_y]^{z-} \] What is $m+n+y+z$?
A train is moving with a speed of \(10 m/s\) towards a platform and blows a horn with frequency \(400 Hz\). Find the frequency heard by a passenger standing on the platform. Take speed of sound = \(310 m/s\).
Two different lenses are used in telescope because
During the detection of Lead, the Formation of which of the following compounds is not used as a confirmatory test.
If mass, radius of cross-section and height of a cylinder are (0.4+0.01) g, (6+0.03) m and height (8+0.04) m. The maximum percentage error in the measurement of density of cylinder is?
IUPAC name of the compound \(K_{3}[Co(C_{2}O_{4})_{3}]\) is
Consider the following:
  1. D.D.T.
  2. Aldrin
  3. Sodium arsenite
  4. Sodium chlorate
How many of these are pesticides?
Match the terms in Column-I with their description in Column-II and choose the correct option:
 Amino Acid Letter Code
(A).Alanine(P).N
(B).Asparagine(Q).A
(C).Aspartic acid(R).R
(D).Arginine(S).D
Two projectiles u1 and u2, with speed of 40 m/s and 60 m/s respectively are thrown at a certain angle, u1 with 30o and u2 with 60o, what is the ratio of range?
An air bubble having volume 1 cm3 at depth 40 m inside water comes to the surface. What will be the volume of the bubble at the surface?
The system of the equations
\(x + y + z = 6\)
\(x + 2y +   \alpha  z = 5 \)
\(x + 2y + 6z = \)\( \beta\) has
How many factors will contribute to a major role in covalent character of a compound.
  1. Polarising power of cation
  2. Polarisability of the anion
  3. Distortion caused by cation
  4. Polarisability of cation
Consider the reaction \(Cu^{2+} + X^- → Cu_2X_2 + X_2\).
X2 will be predominantly?
Read the following two statements
Statement I: Ionic radius of Li+ is greater than Mg++
Statement II: Lithium and magnesium can't form superoxide
Which of the following elements is most reactive?
Select the correct order of electronegativity of the elements: B, C, At, S
The area enclosed by \(y = |x-1| + |x-2|\) and \(y = 3\)
0.5 gm of an organic compound with 60%. Carbon produce ______ gm of \(CO_{2}\) upon complete combustion

Sulphur (S)-containing amino acids from the following are:
(a) Isoleucine
(b) Cysteine
(c) Lysine
(d) Methionine
(e) Glutamic acid

How many statements are correct:
  1. If there is no relation between rate constant and temperature, then activation energy is negative.
  2. If the activation energy is zero, rate constant is temperature independent.
  3. If rate constant increases with increase of temperature, activation energy is positive.
  4. If rate constant decreases with increase in temperature, activation energy is negative.