Practice Questions

Q57.Among CrO, Cr2O3 and CrO3 , the sum of spin-only magnetic moment values of basic and amphoteric oxides is _______ 10−2BM (nearest integer). (Given atomic number of Cr is 24)

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.Consider the following redox reaction: MnO4- + H+ + H2C2O4 ⇌Mn2 + + H2O + CO2 The standard reduction potentials are given as below Ered° E0 = + 1 . 51 V; E0 = - 0 . 49 V CO2 / H2C2O4 MnO4- / Mn2 + If the equilibrium constant of the above reaction is given as Keq = 10x, then the value of x = _______ (nearest integer)

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.A first row transition metal with highest enthalpy of atomisation, upon reaction with oxygen at high temperature forms oxides of formula M2On (where n = 3, 4, 5). The 'spin-only' magnetic moment value of the amphoteric oxide from the above oxides is ______ BM (near integer) (Given atomic number: Sc : 21, Ti : 22, V : 23, Cr : 24, Mn : 25, Fe : 26, Co : 27, Ni : 28, Cu : 29, Zn : 30)

Q57.Consider the following first order gas phase reaction at constant temperature A(g) →2 B( g) + C(g) If the total pressure of the gases is found to be 200 torr after 23sec. and 300 torr upon the complete decomposition of A after a very long time, then the rate constant of the given reaction is ______ ×10−2 s−1 (nearest integer) [Given : log10(2) = 0.301]

Q58.Number of oxygen atoms present in chemical formula of fuming sulphuric acid is ______.

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

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

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 following data were obtained during the first order thermal decomposition of a gas A at constant volume: Ag →2 Bg + Cg S. No Time/s Total pressure/(atm) 1 . 0 0 . 1 2 . 115 0 . 28 The rate constant of the reaction is _______ × 10-2s-1 (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.

Q58.The number of halobenzenes from the following that can be prepared by Sandmeyer's reaction is _______

Q58.Major product B of the following reaction has _______ π-bond.

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.In the reaction of potassium dichromate, potassium chloride and sulfuric acid (conc.), the oxidation state of the chromium in the product is + _______.

Q58.Phthalimide is made to undergo following sequence of reactions. Total number of π bonds present in product 'P' is/are ______

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. The total number of hydrogen atoms in product 𝐴 and product 𝐵 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 ]