List of top Chemistry Questions asked in JEE Main

In Carius method for estimation of halogens, 180 mg of an organic compound produced 143.5 mg of AgCl. The percentage composition of chlorine in the compound is ___________%. [Given: Molar mass in g mol\(^{-1}\) of Ag = 108, Cl = 35.5]

Radius of the first excited state of Helium ion is given as:
\(a_0\) = radius of first stationary state of hydrogen atom.
Which of the following acids is a vitamin?

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

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:

The molecule A changes into its isomeric form B by following a first order kinetics at a temperature of 1000 K. If the energy barrier with respect to reactant energy for such isomeric transformation is 191.48 kJ mol\(^{-1}\) and the frequency factor is \(10^{20}\), the time required for 50\% molecules of A to become B is ________________________ picoseconds (nearest integer). [R = 8.314 J K\(^{-1}\) mol\(^{-1}\)]
In which of the following complexes the CFSE, \(\Delta_0\) will be equal to zero?
Which of the following statement is not true for radioactive decay?

The IUPAC name of the following compound is:

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

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. 
 

When a non-volatile solute is added to the solvent, the vapour pressure of the solvent decreases by 10 mm of Hg. The mole fraction of the solute in the solution is 0.2. What would be the mole fraction of the solvent if the decrease in vapour pressure is 20 mm of Hg?
What is the shape of the \( \text{ClO}_2^- \) ion according to VSEPR theory?
Given below are two statements: Statement (I): For a given shell, the total number of allowed orbitals is given by \( n^2 \). Statement (II): For any subshell, the spatial orientation of the orbitals is given by \( -l \) to \( +l \) values including zero. In the light of the above statements, choose the correct answer from the options given below:
Consider the reaction: \[ X_2Y(g) \rightleftharpoons X_2(g) + \frac{1}{2} Y_2(g) \] The equation representing the correct relationship between the degree of dissociation \( x \) of \( X_2Y(g) \) with its equilibrium constant \( K_p \) is:
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 -----.
Identify the coordination complexes in which the central metal ion has a \(d^4\) configuration.
Identify the coordination complexes
Choose the correct answer from the options given below :
In the reaction \( 2\text{H}_2\text{O}_2 \rightarrow 2\text{H}_2\text{O} + \text{O}_2 \), what is the role of potassium iodide (KI) in this reaction?
Match List-I with List-II. \begin{tabbing} \hspace{5cm} \= \hspace{3cm} \= \hspace{4cm} \= \hspace{5cm} \= \kill List-I \hspace{1cm} \= Isomers of \( C_{10}H_{14} \) \hspace{2cm} \= List-II \hspace{2cm} \= Ozonolysis product
Consider a binary solution of two volatile liquid components 1 and 2. \(x_1\) and \(y_1\) are the mole fractions of component 1 in the liquid and vapor phase, respectively. The slope and intercept of the linear plot of \( \frac{1}{x_1} \) vs \( \frac{1}{y_1} \) are given respectively as:
In an oxidation-reduction reaction, what happens to the oxidation state of the central atom in \( \text{MnO}_4^- \) when it is reduced to \( \text{Mn}^{2+} \)?
pH of water is 7 at 25°C. If water is heated to 80°C, its pH will:
Match List-I with List-II.

Choose the correct answer from the options given below :
Which of the following graphs most appropriately represents a zero-order reaction?
Which of the following compounds exhibits ionic bonding?