JEE Main questions
34495 published questions with worked solutions.
- A soap bubble is blown to a diameter of 7 cm. 36960 erg of work is done in blowing it further. If surface tension of soap...
- Two wavelengths λ_1 and λ_2 are used in Young's double slit experiment λ_1 = 450 nm and λ_2 = 650 nm. The minimum order of fringe...
- An elastic spring under tension of 3 N has a length a. Its length is b under tension 2 N. For its length (3a – 2b), the value of...
- Two forces F_1 and F_2 are acting on a body. One force has magnitude thrice that of the other force and the resultant of the two...
- A solid sphere and a hollow cylinder roll up without slipping on same inclined plane with same initial speed v. The sphere and...
- What pressure (bar) of H_2 would be required to make emf of hydrogen electrode zero in pure water at 25ºC?
- The correct sequence of ligands in the order of decreasing field strength is:
- Match List-I with List-II: List-I (Mechanism steps): (A) Aniline: the lone pair on –NH_2 delocalises into the benzene ring, shown...
- What will be the decreasing order of basic strength of the following conjugate bases? ^-OH, R O, CH_3CO O, Cl
- In the precipitation of the iron group (III) in qualitative analysis, ammonium chloride is added before adding ammonium hydroxide...
- One of the commonly used electrode is calomel electrode. Under which of the following categories calomel electrode comes?
- Number of complexes from the following with even number of unpaired "d" electrons is ____. [V(H_2O)_6]^ 3+ , [Cr(H_2O)_6]^ 2+ ,...
- Which one of the following molecules has maximum dipole moment?
- Number of molecules/ions from the following in which the central atom is involved in sp^3 hybridization is ________. NO_3^-,...
- The Molarity (M) of an aqueous solution containing 5.85 g of NaCl in 500 mL water is: (Given: Molar Mass Na: 23 and Cl: 35.5...
- Identify the correct set of reagents or reaction conditions 'X' and 'Y' in the following set of transformation. CH_3–CH_2–CH_2–Br...
- The correct order of first ionization enthalpy values of the following elements is: (A) O (B) N (C) Be (D) F (E) B Choose the...
- The enthalpy of formation of ethane (C_2H_6) from ethylene by addition of hydrogen where the bond energies of C–H, C–C, C=C, H–H...
- X g of ethylamine is subjected to reaction with NaNO_2/HCl followed by water; evolved dinitrogen gas which occupied 2.24 L volume...
- The de-Broglie's wavelength of an electron in the 4th orbit is _______ πa_0. (a_0 = Bohr's radius)