List of top Chemistry Questions asked in JEE Main

Concentrated nitric acid is labelled as 75%by mass. The volume in mL of the solution which contains 30 g of nitric acid is: Given: Density of nitric acid solution is 1.25 g/mL.
Total number of nucleophiles from the following is: \[ {NH}_3, {PhSH}, {(H}_3{C}_2{S})_2, {H}_2{C}= {C}{H}_2, \, {OH}^-, \, {H}_3{O}^+, \, ({CH}_3)_2 {CO}, \, {NCH}_3 \]
The incorrect decreasing order of atomic radii is:
Which of the following is/are correct with respect to the energy of atomic orbitals of a hydrogen atom? (A) \( 1s<2s<2p<3d<4s \)
(B) \( 1s<2s = 2p<3s = 3p \)
(C) \( 1s<2s<2p<3s<3p \)
(D) \( 1s<2s<4s<3d \) Choose the correct answer from the options given below:
A compound 'X' absorbs 2 moles of hydrogen and 'X' upon oxidation with KMnO4 - H⁺ gives the following products:
A compound 'X' absorbs 2 moles of hydrogen and 'X' upon oxidation with KMnO4
The total number of \(\sigma\) bonds present in the compound 'X' is ----.
Consider the given figure and choose the correct option:
Activation energy
The molar solubility(s) of zirconium phosphate with molecular formula \( \text{Zr}^{4+} \text{PO}_4^{3-} \) is given by relation:
The alkane from below having two secondary hydrogens is:
What is the shape of the \( \text{ClO}_2^- \) ion according to VSEPR theory?

Given below are two statements: 
Statement (I): An element in the extreme left of the periodic table forms acidic oxides.
Statement (II): Acid is formed during the reaction between water and oxide of a reactive element present in the extreme right of the periodic table.

In the light of the above statements, choose the correct answer from the options given below:

Consider the following cases of standard enthalpy of reaction (\( \Delta H_f^\circ \) in kJ mol\(^{-1}\)): \[ \text{C}_2\text{H}_6(g) + 7 \text{O}_2(g) \rightarrow 2 \text{CO}_2(g) + 3 \text{H}_2\text{O}(l) \quad \Delta H_1^\circ = -1550 \] \[ \text{C(graphite)} + \text{O}_2(g) \rightarrow \text{CO}_2(g) \quad \Delta H_2^\circ = -393.5 \] \[ \text{H}_2(g) + \frac{1}{2} \text{O}_2(g) \rightarrow \text{H}_2\text{O}(g) \quad \Delta H_3^\circ = -286 \] The magnitude of \( \Delta H_f^\circ \) of \( \text{C}_2\text{H}_6(g) \) is \(\_\_\_\_\_\) kJ mol\(^{-1}\) (Nearest integer). 
Density of 3 M NaCl solution is 1.25 g/mL. The molality of the solution is:
Identify the number of structure/s from the following which can be correlated to D-glyceraldehyde. 
D-glyceraldehyde
The complex of \( Ni^{2+}\) ion and dimethyl glyoxime contains \(\_\_\_\_\_\) number of Hydrogen (H) atoms. 
Match List - I with List - II. List - I (Partial Derivatives) \(and\) List - II (Thermodynamic Quantity)
(Thermodynamic Quantity
In the light of the above statements, choose the correct answer from the options given below:
The compound with molecular formula C\(_6\)H\(_6\), which gives only one monobromo derivative and takes up four moles of hydrogen per mole for complete hydrogenation has \(\_\_\_\_\_\)\( \pi \) electrons. 
Which of the following compounds exhibits ionic bonding?
Structure of residue (A) and compound (B) formed respectively is:Residue A
The maximum covalency of a non-metallic group 15 element 'E' with the weakest E-E bond is:
In an oxidation-reduction reaction, what happens to the oxidation state of the central atom in \( \text{MnO}_4^- \) when it is reduced to \( \text{Mn}^{2+} \)?
20 mL of 2 M NaOH solution is added to 400 mL of 0.5 M NaOH solution. The final concentration of the solution is \(\_\_\_\_\_\) x \(10^{-2}\)M. (Nearest integer) 
The species which does not undergo disproportionation reaction is:
Niobium (Nb) and ruthenium (Ru) have "x" and "y" number of electrons in their respective 4d orbitals. The value of \( x + y \) is: 
The maximum number of RBr producing 2-methylbutane by above sequence is _____________.
RBr 2 methylbutane
Arrange the following compounds in increasing order of their dipole moment:
HBr, H\(_2\)S, NF\(_3\), and CCl\(_3\)