List of top Chemistry Questions asked in JEE Main

Number of radial nodes present in 3p are

Why does oxygen show anomalous behavior ?

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

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 compounds has intramolecular hydrogen bonding in it?

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:

Find out the final product C

What is the correct IUPAC name of the given compound?

Which of the following has a square pyramidal shape?

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?

The correct stability order of carbocations is

$\textbf{A and B formed in the following reactions are:}$ \[ \text{CrO}_2\text{Cl}_2 + 4\text{NaOH} \rightarrow \text{A} + 2\text{NaCl} + 2\text{H}_2\text{O} \] \[ \text{A} + 2\text{HCl} + 2\text{H}_2\text{O}_2 \rightarrow \text{B} + 3\text{H}_2\text{O} \]

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

In case of isoelectronic species the size of \(F^-\), \(Na\) and \(Na^+\) is affected by:

The products A and B formed in the following reaction scheme are respectively

Which reagent on reacting with phenol gives salicylaldehyde?

Which among the following purification methods is based on the principle of “Solubility” in two different solvents?

Which of the following options contain amphoteric oxide(s) only?

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

$\textbf{The orange colour of } \text{K}_2\text{Cr}_2\text{O}_7 \textbf{ and purple colour of KMnO}_4 \textbf{ is due to}$

$\textbf{Reduction potential of ions are given below:}$
\[ \begin{array}{ccc} \text{ClO}_4^- & \text{IO}_4^- & \text{BrO}_4^- \\ E^\circ = 1.19 \, \text{V} & E^\circ = 1.65 \, \text{V} & E^\circ = 1.74 \, \text{V} \\ \end{array} \]
The correct order of their oxidising power is:

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