Practice Questions

Q57.Molality of 0. 8M H2 SO4 solution (density 1. 06 g cm−3 ) is _______ ×10−3 m . Round off your answer to the nearest integer.

Q57.On a thin layer chromatographic plate, an organic compound moved by 3. 5 cm, while the solvent moved by 5 cm . The retardation factor of the organic compound is _____________ ×10−1

Q57.The potential for the given half cell at 298K is - ............ × 10-2V . 2H + + 2e- →H2 ( g) ( aq ) H+ = 1M, PH2 = 2 atm (Given2 . 303 RT / F = 0 . 06 V, log2 = 0 . 3)

Q57.The spin-only magnetic moment value of the ion among Ti2+, V2+, Co3+ and Cr2+ , that acts as strong oxidising agent in aqueous solution is _______ BM (Near integer). (Given atomic numbers : Ti : 22, V : 23, Cr : 24, Co : 27)

Q57.Given below are two statements : Statement I: The rate law for the reaction A + B →C is rate (r) = k[A]2[B] . When the concentration of both A and B is doubled, the reaction rate is increased " x " times. Statement II : JEE Main 2024 (09 Apr Shift 1) JEE Main Previous Year Paper The figure is showing "the variation in concentration against time plot" for a " y " order reaction. The Value of x + y is ______

Q57.Total number of compounds with Chiral carbon atoms from following is CH3 - CH2 - CHNO2 - COOH CH3 - CH ( I ) - CH2 - NO2 CH3 - CH2 - CHBr - CH2 - CH3 CH3 - CH2 - CH ( OH ) - CH2OH JEE Main 2024 (27 Jan Shift 2) JEE Main Previous Year Paper

Q57.Number of carbocations from the following that are not stabilized by hyperconjugation is _______

Q57.Number of complexes which show optical isomerism among the following is _________. 3 - 3 + 2 + + ) cis - Cr ( ox ) 2Cl2 , Co ( en 3 , cis - Pt ( en ) 2Cl2 , cis - Co ( en ) 2Cl2 2 + 3 - ​, trans - Pt ( en , trans - Cr ( ox ) 2Cl2 ) 2Cl2 Q58.2 - chlorobutane + Cl2 →C4H8Cl2 (isomers) Total number of optically active isomers shown by C4H8Cl2, obtained in the above reaction is ________. JEE Main 2024 (30 Jan Shift 2) JEE Main Previous Year Paper

Q57.The 'spin only' magnetic moment value of MO42− is _______ BM. (Where M is a metal having least metallic radii. among Sc, Ti, V, Cr, Mn and Zn ). (Given atomic number: Sc = 21, Ti = 22, V = 23, Cr = 24, Mn = 25 and Zn = 30)

Q57.The 'Spin only’ Magnetic moment for [Ni ( NH3 ) 6] 2 + is______ × 10 – 1 BM. (given = Atomic number of Ni : 28) Round off your answer to the nearest integer.

Q58.A constant current was passed through a solution of AuCl−4 ion between gold electrodes. After a period of 10. 0 minutes, the increase in mass of cathode was 1. 314 g. The total charge passed through the solution is ___ ×10−2 F. (Given atomic mass of Au = 197)

Q58.The difference in the 'spin-only' magnetic moment values of KMnO4 and the manganese product formed during titration of KMnO4 against oxalic acid in acidic medium is _______ BM. (nearest integer)

Q58.Number of colourless lanthanoid ions among the following is ________ Eu3+, Lu3+, Nd3+, La3+, Sm3+

Q58.In the Claisen-Schmidt reaction to prepare 351 g of dibenzalacetone using 87 g of acetone, the amount of benzaldehyde required is ______ g. (Nearest integer)

Q58.The ratio of 14C in a piece of wood is 1 part that of atmosphere. If half life of 14C is 5730 years, the age of 12C 8 wood sample is ..... years.

Q58.Total number of unpaired electrons in the complex ions [Co(NH3)6]3+ and [NiCl4]2− is

Q58.When ' x ' ×10−2 mL methanol (molar mass = 32 g; density = 0.792 g/cm3 ) is added to 100 mL water (density = 1 g/cm3 ), the following diagram is obtained. x = ______ (nearest integer). [Given : Molal freezing point depression constant of water at 273.15 K is 1.86 K kg mol−1 ]

Q58.The mass of zinc produced by the electrolysis of zinc sulphate solution with a steady current of 0. 015 A for 15 minutes is _ ___ × 10−4 g. (Atomic mass of zinc = 65. 4 amu)

Q58.Consider the following reaction MnO2 + KOH + O2 →A + H2O. Product ' A ' in neutral or acidic medium disproportionate to give products ' B ' and ' C ' along with water. The sum of spin-only magnetic moment values of B and C is BM. (nearest integer) (Given atomic number of Mn is 25) JEE Main 2024 (04 Apr Shift 1) JEE Main Previous Year Paper

Q58.The hydrogen electrode is dipped in a solution of pH = 3 at 25°C. The potential of the electrode will be - 2 . 303RT ______ × 10-2 V. = 0 . 059 V Round off the answer to the nearest integer. F

Q58.The mass of sodium acetate (CH3 COONa) required to prepare 250 mL of 0. 35M aqueous solution is _____ g. ( Molar mass of CH3 COONa is 82. 02 g mol−1 ) Round off to the nearest integer.

Q58.The mass of silver (Molar mass of Ag : 108 gmol−1 ) displaced by a quantity of electricity which displaces 5600 mL of O2 at S.T.P. will be _____ g.

Q59.The product of the following reaction is 𝑃. JEE Main 2024 (31 Jan Shift 1) JEE Main Previous Year Paper The number of hydroxyl groups present in the product 𝑃 is________.

Q59.Number of compounds which give reaction with Hinsberg's reagent is _________. JEE Main 2024 (01 Feb Shift 2) JEE Main Previous Year Paper

Q59.Among the following oxide of p - block elements, Cl2O7, CO, PbO2, N2O, NO, Al2O3, SiO2, N2O5, SnO2