Practice Questions

Q58. Cu(s) + Sn2+(0. 001M) →Cu2+(0. 01M) + Sn(s) The Gibbs free energy change for the above reaction at 298 K is x × 10−1 kJ mol−1 . The value of x is____[nearest integer] [Given : E⊖ = 0. 34 V; E⊖ = −0. 14 V; F = 96500 Cmol−1 ] Cu2+ / Cu Sn2+ / Sn

Q58.The spin-only magnetic moment value of the most basic oxide of vanadium among V2O3 ' V2O4 and V2O5 is____B.M. (Nearest integer)

Q58.Spin only magnetic moment of [MnBr6]4− is _____ B.M. (round off to the closest integer)

Q58.Sum of oxidation state (magnitude) and coordination number of cobalt in NaCobpyCl4 is

Q58.The reaction between X and Y is first order with respect to X and zero order with respect to Y . [X] [Y] Initial rate Experiment molL−1 molL−1 molL−1min−1 JEE Main 2022 (29 Jul Shift 1) JEE Main Previous Year Paper I 0. 1 0. 1 2 × 10−3 II L 0. 2 4 × 10−3 III 0. 4 0. 4 M × 10−3 IV 0. 1 0. 2 2 × 10−3 Examine the data of table and calculate ratio of numerical values of M and L. Q59. [Fe (CN)6]3− should be an inner orbital complex. Ignoring the pairing energy, the value of crystal field stabilization energy for this complex is (−)_____ Δ0 .

Q58.Among the following ores Bauxite, Siderite, Cuprite, Calamine, Haematite, Kaolinite, Malachite, Magnetite, Sphalerite, Limonite, Cryolite, the number of principal ores of iron is JEE Main 2022 (27 Jul Shift 2) JEE Main Previous Year Paper

Q58.In the titration of KMnO4 and oxalic acid in acidic medium, the change in oxidation number of carbon at the end point is

Q58.A gaseous mixture of two substances A and B, under a total pressure of 0. 8 atm is in equilibrium with an ideal liquid solution. The mole fraction of substance A is 0. 5 in the vapour phase and 0. 2 in the liquid phase. The vapour pressure of pure liquid A is____atm.(Nearest integer)

Q58.The number of inter halogens from the following having square pyramidal structure is ClF3, IF7, BrF5, BrF3, I2Cl6, IF5, ClF, ClF5 JEE Main 2022 (28 Jul Shift 1) JEE Main Previous Year Paper

Q58.The rate constant for a first order reaction is given by the following equation : lnk = 33. 24 −2.0×104T K The Activation energy for the reaction is given by kJmol−1 . (In Nearest integer) (Given : R = 8. 3 J K−1 mol−1 )

Q58.In a cell, the following reactions take place Fe2 + →Fe3 + + e- Eo + + = 0 . 77 V Fe3 / Fe2 2I- →I2 + 2e- EI20 / I- = 0 . 54 V The standard electrode potential for the spontaneous reaction in the cell is x × 10-2 V at 298 K. The value of x is - (Nearest Integer)

Q58.For the reaction taking place in the cell: Pt(s)H2(g)H+(aq) || Ag+(aq)|Ag(s) ° E cell = +0. 5332 V. The value of ΔfG⊖ is kJmol−1 . (in nearest integer)

Q58.For the decomposition of azomethane. CH3 N2 CH3(g) →CH3 CH3(g) + N2 a first order reaction, the variation in partial pressure with time at 600 K is given as The half life of the reaction is____ ×10−5 s

Q59.For a reaction, given below is the graph of lnk vs 1T . The activation energy for the reaction is equal to____ cal mol−1 .(Given : R = 2 calK−1 mol−1 ) ​

Q59.The spin-only magnetic moment value of M3+ ion (in gaseous state) from the pairs Cr3+ / Cr2+, Mn3+ / Mn2, Fe3+ / Fe2+ and Co3+ / Co2+ that has negative standard electrode potential, is_____ B. M.

Q59.The disproportionation of MnO42 - in acidic medium resulted in the formation of two manganese compounds A and B. If the oxidation state of Mn in B is smaller than that of A, then the spin-only magnetic moment μ value of B in BM is____ . (Nearest integer)

Q59.It has been found that for a chemical reaction with rise in temperature by 9 K the rate constant gets doubled. Assuming a reaction to be occurring at 300 K, the value of activation energy is found to be kJmol−1 . [nearest integer] (Given ln 10 = 2. 3, R = 8. 3 J K−1 mol−1, log 2 = 0. 30)

Q59.An acidified manganate solution undergoes disproportionation reaction. The spin-only magnetic moment value of the product having manganese in higher oxidation state is____B.M. (Nearest integer)

Q59.A 100 mL solution of CH3CH2MgBr on treatment with methanol produces 2 . 24 mL of a gas at STP. The weight of gas produced is____mg (nearest integer)

Q59.For a reaction A →2B + C the half lives are 100 s and 50 s when the concentration of reactant A is 0. 5 and 1. 0 mol L = respectively. The order of the reaction is

Q59.The major product of the following reaction contains____bromine atom(s). Q60. 2. 5 g of protein containing only glycine (C2H5 NO2) is dissolved in water to make 500 mL of solution. The osmotic pressure of this solution at 300 K is found to be 5. 03 × 10−3 bar. The total number of glycine units present in the protein is (Given : R = 0. 083 L bar K−1 mol−1 )

Q59.The number of stereoisomers formed in a reaction of ± PhC = OCOHCNPh with HCN is

Q59.The Novolac polymer has mass of 963 g. The number of monomer units present in it are

Q59.For a given chemical reaction γ1A + γ2B →γ3C + γ4D. Concentration of C changes from 10 mmol dm-3 to 20 mmol dm-3 in 10 s . Rate of appearance of D is 1 . 5 times the rate of disappearance of B which is twice the rate of disappearance A. The rate of appearance of D has been experimentally determined to be 9 mmol dm-3s-1 . Therefore the rate of reaction is____mmol dm-3s-1 . (Nearest Integer)

Q59. Consider the above reaction. The number of π electrons present in the product ' P ' is