Practice Questions

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 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.Number of moles of H+ ions required by 1 mole of MnO4− to oxidise oxalate ion to CO2 is ______.

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.

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

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

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 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.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 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.

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)

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.Time required for completion of 99 . 9% of first order reaction is ________ times of half life (t1 / 2 ) of the reaction

Q59.Consider the given chemical reaction sequence : Total sum of oxygen atoms in Product A and Product B are _______

Q59.Two moles of benzaldehyde and one mole of acetone under alkaline conditions using aqueous NaOH after heating gives x as the major product. The number of π bonds in the product x is _______

Q59.From 6.55 g of aniline, the maximum amount of acetanilide that can be prepared will be ______ ×10−1 g.

Q59.Total number of species from the following with central atom utilising sp2 hybrid orbitals for bonding is _____. NH3, SO2, SiO2, BeCl2, C2H2, C2H4, BCl3, HCHO, C6H6, BF3, C2H4Cl2