List of top Questions asked in JEE Main

Two closed bulbs of equal volume $(V)$ containing an ideal gas initially at pressure $p_i$ and temperature $T_1$ are connected through a narrow tube of negligible volume as shown in the figure below. The temperature of one of the bulbs is then raised to $T_2$. The final pressure $p_f$ is :

Two particles are performing simple harmonic motion in a straight line about the same equilibrium point. The amplitude and time period for both particles are same and equal to $A$ and $T$, respectively. At time $t = 0$ one particle has displacement $A$ while the other one has displacement $\frac{-A}{2}$ and they are moving towards each other. If they cross each other at time $t$, then $t$ is :

Two sides of a rhombus are along the lines, $x - y + 1 = 0$ and $7x - y - 5 = 0$. If its diagonals intersect at $(-1, -2)$, then which one of the following is a vertex of this rhombus?

Which polymer is used in the manufacture of paints and lacquers?

Which among the following is the most reactive?

Which one of the following alkaline earth metal sulphates has its hydration enthalpy greater than its lattice enthalpy?

Nitrogen and Oxygen are the main components in the atmosphere but these do not react to form oxides of nitrogen. The reaction between nitrogen and oxygen requires high temperature.

In the long form of the periodic table, the valence shell electronic configuration of $5s^2 5p^4$ corresponds to the element present in :

Which of the vitamins given below is water soluble?

Chlorine water on standing loses its colour and forms :

Gaseous $N_2O_4$ dissociates into gaseous $NO_2$ according to the reaction $N _{2} O _{4}( g ) \rightleftharpoons 2 NO _{2}( g )$ At $300\, K$ and $1\, atm$ pressure, the degree of dissociation of $N_2O_4$ is $0.2.$ If one mole of $N_2O_4$ gas is contained in a vessel, then the density of the equilibrium mixture is :

A sample of a hydrate of barium chloride weighing $61\, g$ was heated until all the water of hydration is removed. The dried sample weighed $52\, g.$ The formula of the hydrated salt is : (atomic mass, $Ba = 137\, amu. Cl = 35.5\, amu$)

Calamine is an ore of :

Which artificial sweetener contains chlorine ?

The intermolecular interaction that is dependent on the inverse cube of distance between the molecules is

The least number of oxyacids are formed by :

Which of the following compounds is not colored yellow?

In Carius method of estimation of halogens $250\, mg$ of an organic compound gave $141\, mg$ of $AgBr$. The percentage of bromine in the compound is (atomic mass $Ag\, =\, 108, Br \,= \,80$)

Addition of phosphate fertilisers to water bodies causes :

Choose the incorrect formula out of the four compounds for an element X below :

The colour of $KMnO_4 $ is due to

The ionic radii (in $?$) of $N^{3-},O^{2-} $ and $F^-$ respectively are

The current voltage relation of diode is given by $I=\left(e^{1000 V / T}-1\right) mA$, where the applied voltage $V$ is in volt and the temperature $T$ is in kelvin. If a student makes an error measuring $\pm 0.01\, V$ while measuring the current of

Complete hydrolysis of starch gives :

At temperature T, the average kinetic energy of any particle is $\frac{3}{2}$ kT. The de Broglie wavelength follows the order :