Practice Questions

Q56.A dilute solution of sulphuric acid is electrolysed using a current of 0. 10 A for 2 hours to produce hydrogen and oxygen gas. The total volume of gases produced at STP is cm3 . (Nearest integer) [Given : Faraday constant F = 96500 Cmol−1 at STP, molar volume of an ideal gas is 22. 7 L mol−1 ]

Q57.The distance between Na+ and Cl- ions in solid NaCl of density 43 . 1 gcm-3 is . . . . . × 10-10 m. (Nearest Integer) (Given : NA = 6 . 02 × 1023 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.In the presence of sunlight, benzene reacts with Cl2 to give product, X . The number of hydrogens in X is

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

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.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.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 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.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.Resistance of a conductivity cell (cell constant 129 m−1 ) filled with 74. 5 ppm solution of KCl is 100 Ω (labelled as solution 1). When the same cell is filled with KCl solution of 149 ppm, the resistance is 50 Ω (labelled as solution 2). The ratio of molar conductivity of solution 1 and solution 2 is i.e. ∧1 = x × 10−3 . The ∧2 value of x is____Given, molar mass of KCl is 74. 5 g mol−1 )

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 total number of monobromo derivatives formed by the alkanes with molecular formula C5H12 is (excluding stereo isomers)

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.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.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)

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 .

Q58.The number of terminal oxygen atoms present in the product B obtained from the following reaction is FeCr2 O4 + Na2 CO3 + O2 →A + Fe2 O3 + CO2 A + H+ →B + H2O + Na+

Q58.Total number of isomers (including stereoisomers) obtain on monochlorination of methylcyclohexane is

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.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.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.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