List of top Chemistry Questions asked in JEE Main

Complementary stand of DNA ATGCTTCA is:

In Kjeldahl's method for estimation of nitrogen, \(CuSO_4\) acts as

An ideal gas undergoes a cyclic transformation starting from the point \( A \) and coming back to the same point by tracing the path \( A \to B \to C \to A \) as shown in the diagram. The total work done in the process is \( \_\_\_\_ \) J.

Which reagent gives bright red ppt. With \(Ni^{2+}\) in basic medium?

Which of the following is correct for adiabatic free expansion against vacuum?

Which of the following has the highest 3rd ionization energy?

Which of the following sets of elements can be detected by Lassaigne's Test ?

Which of the following compounds has intramolecular hydrogen bonding in it?

Which of the following compounds in 3d series does not show +3 oxidation state?

The ratio of magnitude of potential energy and kinetic energy for \(5^{th}\) excited state of hydrogen atom is

Which of the following have a trigonal bipyramidal shape?
\(PF_5, PBr_5, [PtCl_4], SF_6, BF_3, BrF_5, PCl_5, [Fe(CO)_5]\)

Solubility of \(Ca_3(PO_4)_2\) in \(100\) \(mL\) of pure water is \(W\) gm. Find out \(K_{sp}\) of \(Ca_3(PO_4)_2\) is: (M: Molecular mass of \(Ca_3(PO_4)_2\))

We are given with three NaCl samples and their Van't Hoff factors. Which is correct option ?

Sample	Van't Haff Factor
Sample - 1 (0.1 M)	\(i_1\)
Sample - 2 (0.01 M)	\(i_2\)
Sample - 3 (0.001 M)	\(i_2\)

Which of the following elements has the highest 1st ionization energy ?

Why does oxygen show anomalous behavior ?

Consider the following two statements 
Statement I: In \(p\) and \(d\) block both metals and non - metals are present 
Statement II: Electronegativity and ionisation enthalpy of metals is greater than non - metals

On which factor, electrical conductivity of electrolytic cell does not depend

Find out the final product C

The correct stability order of carbocations is

Statement I: Since fluorine is more electronegative than nitrogen, the net dipole moment of NF₃ is greater than NH₃.
Statement II: In NH₃, the orbital dipole due to the lone pair and the dipole moment of NH bonds are in opposite directions, but in NF₃, the orbital dipole due to the lone pair and the dipole moments of N-F bonds are in the same direction.
In light of the above statements, choose the most appropriate from the options given below:

What is the structure of Mn₂(CO)₁₀?

Magnetic moment due to the motion of the electron in n^th orbit of Bohr atom is proportional to n^x. The value of x is

Which reagent on reacting with phenol gives salicylaldehyde?

Statement I: Along the period, the chemical reactivity of the element gradually increases from group 1 to group 18.
Statement II: The nature of oxides formed by group 1 element is basic while that of group 17 elements is acidic.
In the light of the above statements, choose the most appropriate from the questions given below:

Decreasing order of electron gain enthalpy of the following elements (magnitude only)
Sulphur A, Bromine - B, Fluorine C, Argon D