Practice Questions

Q57.The activation energy of one of the reactions in a biochemical process is 532611 J mol−1 . When the temperature falls from 310 K to 300 K , the change in rate constant observed is k300 = x × 10−3k310° . The value of x is [Given: ln 10 = 2. 3 R = 8. 3 J K−1 mol−1 ]

Q57.For the given first order reaction A →B the half life of the reaction is 0 . 3010 min. The ratio of the initial concentration of reactant to the concentration of reactant at time 2 . 0 min will be equal to _____. (Nearest integer)

Q57.The spin-only magnetic moment value of the compound with strongest oxidizing ability among MnF4, MnF3 and MnF2 is_____ B . M (nearest integer)

Q57.A solution containing 2. 5 × 10−3 kg of a solute dissolved in 75 × 10−3 kg of water boils at 373. 535 K. The molar mass of the solute is mol−1⋅ [nearest integer] (Given : Kb(H2O) = 0. 52 K kg mol−1 and boiling point of water = 373. 15 K)

Q57.Metal M crystallizes into a FCC lattice with the edge length of 4. 0 × 10−8 cm. The atomic mass of the metal is g/ mol. (Use : NA = 6. 02 × 1023 mol−1 , density of metal, M = 9. 03 g cm−3 )

Q57.Consider the following sulphure based oxoacids. H2SO3, H2SO4, H2S2O8 and H2S2O7. Amongst these oxoacids, the number of those with peroxo O - Obond is

Q57.The osmotic pressure exerted by a solution prepared by dissolving 2. 0 g of protein of molar mass 60 kg mol−1 in 200 mL of water at 27 °C is____ Pa . [integer value] (use R = 0. 083 L bar mol−1 K−1 )

Q57.The equation k = (6. 5 × 1012 s−1)e−26000 K/T is followed for the decomposition of compound A. The activation energy for the reaction is ____ KJ mol−1 . [nearest integer] (Given: R = 8. 314 J K−1 mol−1 )

Q57.PCl5 + H2O →A + HCl A + H2O →B + HCl Find number of ionisable hydrogen in B

Q57.The limiting molar conductivities of NaI, NaNO3 and AgNO3 are 12. 7, 12. 0 and 13. 3 mSm2 mol−1 , respectively (all at 25 °C ). The limiting molar conductivity of AgI at this temperature is____ mSm2 mol−1 .

Q57.When 200 mL of 0. 2 M acetic acid is shaken with 0. 6 g of wood charcoal, the final concentration of acetic acid after adsorption is 0. 1 M. The mass of acetic acid adsorbed per gram of carbon is g .

Q57.The cell potential for the following cell Pt|H2(g)|H+(aq) Cu2+(0 .01 M) Cu(s) is 0. 576 V at 298 K . The pH of the solution is (Nearest integer) (Given : Eo = 0. 34 V and 2.303F RT = 0. 06 V ) Cu2+ / Cu

Q57.The solubility product of a sparingly soluble salt A2X3 is 1. 1 × 10−23 . If specific conductance of the solution is 3 × 10−5 Sm−1 , the limiting molar conductivity of the solution is x × 10−3 S m2 mol−1 . The value of x is

Q57.The half life for the decomposition of gaseous compound A is 240 s when the gaseous pressure was 500 Torr initially. When the pressure was 250 Torr, the half life was found to be 4 . 0 min. The order of the reaction is _____ (Nearest integer)

Q58.The rate constants for decomposition of acetaldehyde have been measured over the temperature range 700 −1000 K . The data has been analysed by plotting lnk vs 103T graph. The value of activation energy for the reaction is kJmol−1 . (Nearest integer) (Given : R = 8. 31 JK−1 mol−1 )

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

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.Among Co3 + , Ti2 + , V2 + and Cr2 + ions, one if used as a reagent cannot liberate H2 from dilute mineral acid solution, its spin-only magnetic moment in gaseous state is _____ B.M. (Nearest integer) JEE Main 2022 (25 Jul Shift 1) JEE Main Previous Year Paper

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

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

Q58.(a) CoCl3. 4 NH3 , (b) CoCl3 ⋅5 NH3 , (c) CoCl3 ⋅6 NH3 and (d) CoCl (NO3)2 ⋅5 NH3 Number of complex(es) which will exist in cis-trans form is/are

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