List of top Chemistry Questions asked in JEE Main

Given below are two statements: 

Statement I: In the oxalic acid vs KMnO$_4$ (in the presence of dil H$_2$SO$_4$) titration the solution needs to be heated initially to 60°C, but no heating is required in Ferrous ammonium sulphate (FAS) vs KMnO$_4$ titration (in the presence of dil H$_2$SO$_4$). 

Statement II: In oxalic acid vs KMnO$_4$ titration, the initial formation of MnSO$_4$ takes place at high temperature, which then acts as catalyst for further reaction. In the case of FAS vs KMnO$_4$, heating oxidizes Fe$^{2+}$ into Fe$^{3+}$ by oxygen of air and error may be introduced in the experiment. 

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

The correct order of stability of following carbocations is:
The correct order of stability of following carbocations is

Match List-I with List-II. 

The products A and B in the following reactions, respectively, are:
The products A and B in the following reactions
Identify A, B, and C in the given reaction sequence: \[ \text{A} \xrightarrow{\text{HNO}_3} \text{Pb(NO}_3)_2 \xrightarrow{\text{H}_2\text{SO}_4} \text{B} \rightarrow \text{C (Yellow ppt)}. \]

Standard electrode potentials for a few half-cells are mentioned below: 

Consider the following reactions: \[ \text{NH}_2 \text{O} \xrightarrow{\text{NaNO}_2, \text{HCl}, 0-5^\circ C} [A] \xrightarrow{\text{HCl dil.}, \text{NaOH}} [B] \] - (i) The molecular formula of [A] is C₁₄H₁₄N₂O₂
- (ii) The molecular formula of [C] is C₁₆H₁₈N₂O₂ The total number of sp³ hybridized carbon atoms in the major product [C] formed is -----.

Consider the following sequence of reactions :

Molar mass of the product formed (A) is ______ g mol\(^{-1}\).

The number of molecules/ions that show linear geometry among the following is _____. SO₂, BeCl₂, CO₂, N₃⁻, NO₂, F₂O, XeF₂, NO₂⁺, I₃⁻, O₃

The incorrect statements regarding geometrical isomerism are: 
(A) Propene shows geometrical isomerism. 
(B) Trans isomer has identical atoms/groups on the opposite sides of the double bond. 
(C) Cis-but-2-ene has higher dipole moment than trans-but-2-ene. 
(D) 2-methylbut-2-ene shows two geometrical isomers. 
(E) Trans-isomer has lower melting point than cis isomer. 
 

From the magnetic behaviour of \([NiCl_4]^{2-}\) (paramagnetic) and [Ni\((CO)_4\)] (diamagnetic), choose the correct geometry and oxidation state.

The products formed in the following reaction sequence are:

Arrange the following solutions in order of their increasing boiling points.
(i) \(10^{-4}\) M NaCl
(ii) \(10^{-4}\) M Urea
(iii) \(10^{-3}\) M NaCl
(iv) \(10^{-2}\) M NaCl
In which of the following complexes the CFSE, \(\Delta_0\) will be equal to zero?

The compounds which give positive Fehling's test are:
The compounds which give positive Fehling's test are:
Choose the CORRECT answer from the options given below:

Which of the following electrolyte can be used to obtain \( \text{H}_2\text{S}_2\text{O}_8 \) by the process of electrolysis?

The IUPAC name of the following compound is:

A vessel at 1000 K contains \( \text{CO}_2 \) with a pressure of 0.5 atm. Some of \( \text{CO}_2 \) is converted into \( \text{CO} \) on addition of graphite. If total pressure at equilibrium is 0.8 atm, then \( K_p \) is:
Given below are two statements: Statement I: One mole of propyne reacts with excess of sodium to liberate half a mole of H₂ gas. Statement II: Four g of propyne reacts with NaNH₂ to liberate NH₃ gas which occupies 224 mL at STP. In the light of the above statements, choose the most appropriate answer from the options given below:
Given below are two statements: Statement I: CH\(_3\)-O-CH\(_2\)-Cl will undergo \( S_N1 \) reaction though it is a primary halide.
Statement II: {CH_3-C(-CH_3)(-CH_3)-CH_2-Cl}
will not undergo \( S_N2 \) reaction very easily though it is a primary halide. In the light of the above statements, choose the most appropriate answer from the options given below:
Radius of the first excited state of Helium ion is given as:
\(a_0\) = radius of first stationary state of hydrogen atom.
A liquid when kept inside a thermally insulated closed vessel at \(25^{\circ}C\) was mechanically stirred from outside. What will be the correct option for the following thermodynamic parameters?
Which of the following acids is a vitamin?

Match List-I with List-II:

Lanthanoid ions with \(4f^7\) configuration are: (A) Eu\(^{2+}\) (B) Gd\(^{3+}\) (C) Eu\(^{3+}\) (D) Tb\(^{3+}\) (E) Sm\(^{2+}\) Choose the correct answer from the options given below: