JEE Main questions
34495 published questions with worked solutions.
- A spaceship in space sweeps stationary interplanetary dust. As a result, its mass increases at a rate dM dt =bv^2(t), where v(t)...
- The correct match between the entries in column I and column II are : List-I: (a) Microwave (b) Gamma rays (c) A.M. radio waves...
- The surface of a metal is illuminated alternately with photons of energies E_1 = 4eV and E_2 = 2.5 eV respectively. The ratio of...
- Nitrogen gas is at 300°C temperature. The temperature (in K) at which the rms speed of a H_2 molecule would be equal to the rms...
- A body of mass 2 kg is driven by an engine delivering a constant power 1 J/s. The body starts from rest and moves in a straight...
- A prism of angle A = 1° has a refractive index = 1.5. A good estimate for the minimum angle of deviation (in degrees) is close to...
- The correct statement about probability density (except at infinite distance from nucleus) is :
- The compound that has the largest H–M–H bond angle (M=N, O, S, C), is -
- Which one of the following polymers is not obtained by condensation polymerisation?Not in JEE Main or NEET syllabus
- Boron and silicon of very high purity can be obtained through :Not in JEE Main or NEET syllabus
- Lattice enthalpy and enthalpy of solution of NaCl are 788 kJ mol ^ -1 and 4 kJ mol ^ -1 , respectively. The hydration enthalpy of...
- Reaction of ammonia with excess Cl_2 gives -
- The correct order of the ionic radii of O^ 2- , N^ 3- , F^- , Mg^ 2+ , Na^+ and Al^ 3+ is :
- Consider the complex ions, trans-[ Co(en)_2Cl_2 ]^+ (A) and cis-[ Co(en)_2Cl_2 ]^+ (B). The correct statement regarding them is :
- The number of chiral carbons present in sucrose is _________ .
- For a dimerization reaction, 2A(g) → A_2(g) at 298 K, U = – 20kJ mol ^ -1 , S = – 30J K ^ -1 mol ^ -1 , then the G will be...
- For a reaction; X + Y 2Z, 1.0 mol of X, 1.5 mol of Y and 0.5 mol of Z were taken in a 1 L vessel and allowed to react. At...
- The volume, in mL, of 0.02 M K_2Cr_2O_7 solution required to react with 0.288 g of ferrous oxalate in acidic medium is_______....
- Considering that _0>P, the magnetic moment (in BM) of [ Ru(H_2O)_6 ]^ 2+ would be________ .
- If the system of linear equations x+y+3z=0 x+3y+k^2z=0 3x+y+3z=0 has a non-zero solution (x, y, z) for some k ∈ R, then x+ ( y z...