Practice Questions

Q50.An antiseptic dettol is a mixture of two compounds 'A' and 'B' where A has 6π electrons and B has 2π electrons. What is B? (1) Bithional (2) Terpineol (3) Chlorophenol (4) Chloroxyenol

Q50.Which of the following compounds is an example of hypnotic drug? (1) Seldane (2) Amytal (3) Aspartame (4) Prontosil

Q50.Which of the following is reducing sugar? JEE Main 2022 (26 Jul Shift 1) JEE Main Previous Year Paper (1) (2) (3) (4)

Q51.Consider an imaginary ion 48X322 - . The nucleus contains 'a' % more neutrons than the number of electrons in the ion. The value of 'a' is

Q51.At 300 K, a sample of 3. 0 g of gas A occupies the same volume as 0. 2 g of hydrogen at 200 K at the same pressure. The molar mass of gas A is g mol−1 . (nearest integer) Assume that the behaviour of gases as ideal. (Given: The molar mass of hydrogen (H2) gas is 2. 0 g mol−1 .)

Q51.If the uncertainty in velocity and position of a minute particle in space are, 2. 4 × 10−26(ms−1) and 10−7(m) respectively. The mass of the particle in g is___(Nearest integer) (Given : h = 6. 626 × 10−34 Js) Q52. 2 NOCl(g) ⇌2 NO(g) + Cl2(g) In an experiment, 2. 0 moles of NOCl was placed in a one-litre flask and the concentration of NO after equilibrium established, was found to be 0. 4 mol /L. The equilibrium constant at 30 °C is_____ ×10−4 .

Q51.In the given reaction, X + Y + 3Z ⇄XYZ3 if one mole of each of X and Y with 0 . 05 mol of Z gives compound XYZ3. (Given : Atomic masses of X, Y and Z are 10,20 and 30amu, respectively). The yield of XYZ3 is____g.

Q51.On complete combustion 0. 30 g of an organic compound gave 0. 20 g of carbon dioxide and 0. 10 g of water. The percentage of carbon in the given organic compound is____(Nearest Integer)

Q51.Chlorophyll extracted from the crushed green leaves was dissolved in water to make 2 L solution of Mg of concentration 48ppm. The number of atoms of Mg in this solution is x × 1020 atoms. The value of x is (Nearest Integer) (Given : Atomic mass of Mg is 24 g mol−1 , NA = 6. 02 × 1023 mol−1 )

Q51.A box contains 0. 90 g of liquid water in equilibrium with water vapour at 27°C. The equilibrium vapour pressure of water at 27°C 32. 0 Torr. When the volume of the box is increased, some of the liquid water evaporates to maintain the equilibrium pressure. If all the liquid water evaporates, then the volume of the box must be ______ litre. [nearest integer] (Given: R = 0. 082 L atm K−1 mol−1 _ (Ignore the volume of the liquid water and assume water vapours behave as an ideal gas.) Q52. 2. 2 g of nitrous oxide (N2O) gas is cooled at a constant pressure of 1 atm from 310 K to 270 K causing the compression of the gas from 217. 1 mL to 167. 75 mL. The change in internal energy of the process, △U is ′−x′J. The value of ′x′ is _____. [nearest integer] (Given: atomic mass of N = 14 g mol−1 and of O = 16 g mol−1 . Molar heat capacity of N2O is 100 JK−1 mol−1 )

Q51.Among the following species N2, N2+, N2- , N22 - , O2, O2+, O2- , O22 - the number of species showing diamagnetism is

Q51.Geraniol, a volatile organic compound, is a component of rose oil. The density of the vapour is 0. 46 gL−1 at 257 °C and 100 mmHg . The molar mass of geraniol is (Nearest Integer) [Given R = 0. 082 L atm K−1 mol−1 ] Q52. 17. 0 g of NH3 completely vapourises at −33. 42 °C and 1 bar pressure and the enthalpy change in the process is 23. 4 kJ mol−1 . The enthalpy change for the vapourisation of 85 g of NH3 under the same conditions is kJ.

Q51.The number of N atoms in 681 g of C7H5N3O6 is 𝑥× 1021. The value of x is NA = 6 . 02 × 1023 mol-1 (Nearest Integer) JEE Main 2022 (25 Jun Shift 1) JEE Main Previous Year Paper Q52.1 L aqueous solution of H2SO4 contains 0 . 02 m mol H2SO4 . 50% of this solution is diluted with deionized water to give 1 L solution A. In solution A, 0 . 01 m mol of H2SO4 are added. Total m mols of H2SO4 in the final solution is____ × 10-3 m moles.

Q51. CNG is an important transportation fuel. When 100 gCNG is mixed with 208 g oxygen in vehicles, it leads to the formation of CO2 and H2O and produces large quantity of heat during this combustion, then the amount of carbon dioxide, produced in grams is [nearest integer] [Assume CNG to be methane]

Q51.If the work function of a metal is 6. 63 × 10−19 J, the maximum wavelength of the photon required to remove a photoelectron from the metal is____ nm. Nearest integer) [Given : h = 6. 63 × 10−34 J s, and c = 3 × 108 m s−1 ]

Q51.Amongst the following the number of oxide(s) which are paramagnetic in nature is Na2 O, KO2, NO2, N2O, ClO2, NO, SO2, Cl2 O

Q51.A protein 'A' contains 0 . 30% of glycine (molecular weight 75). The minimum molar mass of the protein 'A' is____ × 103 g mol-1 [nearest integer] JEE Main 2022 (25 Jun Shift 2) JEE Main Previous Year Paper

Q51.The complete combustion of 0. 492 g of an organic compound containing ' C', ' H' and ' O' gives 0. 793 g of CO2 and 0. 442 g of H2O. The percentage of oxygen composition in the organic compound is____.(nearest integer) Q52. 100 g of an ideal gas is kept in a cylinder of 416 L volume at 27 °C under 1. 5 bar pressure. The molar mass of the gas is g mol−1 . (Nearest integer) (Given : R = 0. 083 L bar K−1 mol−1 )

Q51.The minimum uncertainty in the speed of an electron in one dimensional region of length 2ao (Where ao = Bohr radius 52. 9 pm) is____ kms−1 (Nearest integer) (Given : Mass of electron = 9. 1 × 10−31 kg , Planck's constant h = 6. 63 × 10−34 Js)

Q51.A 1 . 84mg sample of polyhydric alcoholic compound 'X' of molar mass 92 . 0 g / mol gave 1 . 344 mL of H2 gas at STP. The number of alcoholic hydrogen present in compound 'X' is

Q52.Consider the following set of quantum numbers. n l m1 A 3 3 −3 B 3 2 −2 C 2 1 +1 D 2 2 +2 JEE Main 2022 (27 Jun Shift 2) JEE Main Previous Year Paper The number of correct sets of quantum numbers is

Q52.The moles of methane required to produce 81 g of water after complete combustion is____ ×10−2 mol. [nearest integer]

Q52.On complete combustion of 0 . 492 g of an organic compound containing C, H and O, 0 . 7938 g of CO2 and 0 . 4428 g of H2O was produced. The % composition of oxygen in the compound is____. (Nearest Integer)

Q52.When the excited electron of a H atom from n = 5 drops to the ground state, the maximum number of emission lines observed are

Q52.The pressure of a moist gas at 27°C is 4 atm. The volume of the container is doubled at the same temperature. The new pressure of the moist gas is … × 10-1 atm. (Nearest integer) (Given: The vapour pressure of water at 27°C is 0 . 4 atm)