List of top Chemistry Questions asked in JEE Main

Given below are two statements:
Statement I: The metallic radius of Al is less than that of Ga.
Statement II: The ionic radius of Al$^{3+}$ is less than that of Ga$^{3+}$.
In the light of the above statements, choose the most appropriate answer from the options given below:

Given below are two statements:
Statement I: Vanillin will react with NaOH and also with Tollen’s reagent.

Statement II: Vanillin will undergo self-aldol condensation very easily.

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

A solution is made by mixing one mole of volatile liquid A with 3 moles of volatile liquid B. The vapor pressure of pure A is 200 mm Hg and that of the solution is 500 mm Hg. The vapor pressure of pure B and the least volatile component of the solution, respectively, are:

Two vessels A and B are connected via stopcock. Vessel A is filled with a gas at a certain pressure. The entire assembly is immersed in water and allowed to come to thermal equilibrium with water. After opening the stopcock the gas from vessel A expands into vessel B and no change in temperature is observed in the thermometer. Which of the following statement is true?

Which of the following graph correctly represents the plots of $K_H$ at 1 bar gases in water versus temperature?

The property/properties that show irregularity in the first four elements of group-17 are:

Density of 3 M NaCl solution is 1.25 g/mL. The molality of the solution is:

In a reaction A + B → C, initial concentrations of A and B are related as $ [\text{A}]_0 = 8[\text{B}]_0 $. The half lives of A and B are 10 min and 40 min, respectively. If they start to disappear at the same time, both following first order kinetics, after how much time will the concentration of both the reactants be same?

Electrolysis of 600 mL aqueous solution of NaCl for 5 min changes the pH of the solution to 12. The current in Amperes used for the given electrolysis is ….. (Nearest integer).

Statement-1: $ \text{ClF}_3 $ has 3 possible structures.
Statement-2: $ \text{III} $ is the most stable structure due to least lone pair-bond pair (lp-bp) repulsion.