JEE Main questions
34495 published questions with worked solutions.
- 5 beats/second are heard when a tuning fork is sounded with a sonometer wire under tension, when the length of the sonometer wire...
- Two Carnot engines A and B are operated in series. Engine A receives heat from a reservoir at 600 K and rejects heat to a...
- A convergent doublet of separated lenses, corrected for spherical aberration, has resultant focal length of 10 cm. The separation...
- A body takes 10 minutes to cool from 60°C to 50°C. The temperature of surroundings is constant at 25°C. Then, the temperature of...
- When an air bubble of radius r rises from the bottom to the surface of a lake, its radius becomes 5r 4 . Taking the atmospheric...
- Muon ( ^ -1 ) is negatively charged (|q| = |e|) with a mass m_ = 200 ,m_e, where m_e is the mass of the electron and e is the...
- The value closest to the thermal velocity of a Helium atom at room temperature (300K) in ms^ -1 is - [k_B = 1.4 10^ -23 J/K; m_...
- In KO_2, the nature of oxygen species and the oxidation state of oxygen atom are, respectively :
- _fG° at 500 K for substance 'S' in liquid state and gaseous state are + 100.7 kcal mol^ -1 and + 103 kcal mol^ -1 , respectively....
- In XeO_3F_2, the number of bond pair (s), π-bond (s) and lone pair (s) on Xe atom respectively are -
- Following four solutions are prepared by mixing different volumes of NaOH and HCl of different concentrations. pH of which one of...
- Given (i) 2Fe_2O_3(s) → 4Fe(s) + 3O_2(g); _rG° = + 1487.0 kJ mol^ -1 (ii) 2CO(g) + O_2(g) → 2CO_2(g); _rG° = –514.4 kJ mol^ -1...
- At a certain temperature in a 5L vessel, 2 moles of carbon monoxide and 3 moles of chlorine were allowed to reach equilibrium...
- The correct order of spin-only magnetic moments among the following is : (Atomic number : Mn = 25, Co = 27, Ni = 28, Zn = 30)
- When 2-butyne is treated with H_2/Lindlar's catalyst, compound X is produced as the major product and when treated with Na/liq....
- For a first order reaction, A → P, t_ 1/2 (half-life) is 10 days. The time required for 1 4 ^ th conversion of A (in days) is –...
- Lithium aluminium hydride reacts with silicon tetrachloride to form -
- The correct order of electron affinity is -
- Two 5 molal solutions are prepared by dissolving a non-electrolyte, non-volatile solute separately in the solvents X and Y. The...
- All of the following share the same crystal structure except -Not in JEE Main or NEET syllabus