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

Q57.Consider the following transformation involving first order elementary reaction in each step at constant Step 2 −temperature as shown below. A + B Step 1C → P Some details of the above reactions are listed below. Step 3 Step Rate constant (sec−1) Activation energy (kJ mol−1) 1 k1 300 If the overall rate constant of the above 2 k2 200 3 k3 Ea3 transformation (k) is given as k = k1k2 and the overall activation energy (Ea) is 400 kJ mol−1 , then the value k3 of Ea3 is kJmol−1 (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.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 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.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.The osmotic pressure of a dilute solution is 7 × 105 Pa at 273 K. Osmotic pressure of the same solution at 283 K is _______ × 104 Nm−2 .(Nearest integer)

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 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.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.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]

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.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.Molality of an aqueous solution of urea is 4.44 m. Mole fraction of urea in solution is x × 10−3 . Value of x is - (Integer answer)

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 ______

Q58. The total number of hydrogen atoms in product 𝐴 and product 𝐵 is__________.

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.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.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 number of halobenzenes from the following that can be prepared by Sandmeyer's reaction 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.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+