Practice Questions

Q55.For a cell, CusCu2 + 0 . 001M ) Ag+0 . 01MAgsthe cell potential is found to be 0 . 43 V at 298 K. The magnitude of standard electrode potential for Cu2 + | Cu is____ × 10-2 V 𝛩 2 . 303RT Given: EAg+ / Ag = 0 . 80 V and F = 0 . 06 V

Q55.Elevation in boiling point for 1. 5 molal solution of glucose in water is 4 K. The depression in freezing point for 4. 5 molal solution of glucose in water is 4 K. The ratio of molal elevation constant to molal depression constant (Kb/Kf) is

Q55.An element M crystallises in a body centred cubic unit cell with a cell edge of 300pm. The density of the element is 6 . 0 g cm-3. The number of atoms present in 180 g of the element is____ × 1023. (Nearest integer) Q56.150 g of acetic acid was contaminated with 10 . 2 g ascorbic acid C6H8O6 to lower down its freezing point by x × 10-1°C. The value of x is____ (Nearest integer). [Given Kf = 3 . 9 K kg mol-1; Molar mass of ascorbic acid = 176 g mol-1]

Q55.For the given reactions Sn2+ + 2e−→Sn ° ° Sn4+ + 4e−→Sn the electrode potentials are ; E Sn2+ / Sn = −0. 140 V and E Sn4+ / Sn = 0. 010 V. The ° magnitude of standard electrode potential for Sn4+ / Sn2+ i.e. E Sn4+ / Sn2+ is____ ×10−2 V(Nearest integer)

Q55.A company dissolves ' x ' amount of CO2 at 298 K in 1 litre of water to prepare soda water. X = ×10−3 g . (nearest integer) (Given: partial pressure of CO2 at 298 K = 0. 835 bar. Henry's law constant for CO2 at 298 K = 1. 67 kbar. Atomic mass of H, C and O is 1, 12 , and 6 g mol−1 , respectively)

Q55.The number of sp3 hybridised carbons in an acyclic neutral compound with molecular formula C4H5N is

Q56.Assuming 1μg of trace radioactive element X with a half life of 30 years is absorbed by a growing tree. The amount of X remaining in the tree after 100 years is_____ × 10-1μg. [Given : ln10 = 2 . 303; log2 = 0 . 30]

Q56.In a solid AB, A atoms are in ccp arrangement and B atoms occupy all the octahedral sites. If two atoms from the opposite faces are removed, then the resultant stoichiometry of the compound is AxBy . The value of x is [nearest integer]

Q56.When a certain amount of solid A is dissolved in 100 g of water at 25 °C to make a dilute solution, the vapour pressure of the solution is reduced to one-half of that of pure water. The vapour pressure of pure water is 23. 76 mmHg . The number of moles of solute A added is Q57. [A] → [B] Reactant Product If formation of compound [B] follows the first order of kinetics and after 70 minutes the concentration of [A] was found to be half of its initial concentration. Then the rate constant of the reaction is x × 10−6 s−1 . The value of x is____

Q56.A flask is filled with equal moles of A and B. The half lives of A and B are 100 s and 50 s respectively and are independent of the initial concentration. The time required for the concentration of A to be four times that of B is____ s. (Given : ln 2 = 0. 693 ) Q57. 2. 0 g of H2 gas is adsorbed on 2. 5 g of platinum powder at 300 K and 1 bar pressure. The volume of the gas adsorbed per gram of the adsorbent is mL (Given : R = 0. 083 L bar K−1 mol−1 )

Q56.The number of non-ionisable protons present in the product B obtained from the following reaction is___ C2H5OH + PCl3 →C2H5Cl + A A + PCl3 →B

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 ]

Q56.The osmotic pressure of blood is 7. 47 bar at 300 K . To inject glucose to a patient intravenously, it has to be isotonic with blood. The concentration of glucose solution in gL−1 is (Molar mass of glucose = 180 g mol−1 , R = 0. 083 Lbar−1 mol−1 ) (Nearest integer)

Q56.In the following reaction ​ The % yield for reaction I is 60% and that of reaction II is 50%. The overall yield of the complete reaction is % Q57. 2NO + 2H2 →N2 + 2H2O The above reaction has been studied at 800 °C . The related data are given in the table below Initial Reaction serial Initial pressure of Initial rate Pressure −dp /s) number H2/ kPa ( dt )/(kPa of NO / kPa 1 65. 6 40. 0 0. 135 2 65. 6 20. 1 0. 033 3 38. 6 65. 6 0. 214 4 19. 2 65. 6 0. 106 The order of the reaction with respect to NO is____

Q56.The cell potential for ZnZn2 + (aq)‖Snx + Sn is 0 . 801V at 298 K. The reaction quotient for the above reaction is 10-2. The number of electrons involved in the given electrochemical cell reaction is _____ . 0 0 2 . 303RT = + 0 . 008 V and = 0 . 06 V) = - 0 . 763 V, ESnx + | Sn (Given EZn2 + ∣Zn F

Q56.If O2 gas is bubbled through water at 303 K, the number of millimoles of O2 gas that dissolve in 1 litre of water is____(Nearest integer) (Given : Henry's Law constant for O2 at 303 K is 46. 82k bar and partial pressure of O2 = 0. 920 bar) (Assume solubility of O2 in water is too small, nearly negligible)

Q56.The separation of two coloured substances was done by paper chromatography. The distances travelled by solvent front, substance A and substance B from the base line are 3. 25 cm. 2. 08 cm and 1. 05 cm . respectively. The ratio of Rf values of A to B is (Answer the nearest integer)

Q56.A radioactive element has a half life of 200 days. The percentage of original activity remaining after 83 days is____(Nearest integer) (Given : antilog 0. 125 = 1. 333, antilog 0. 693 = 4. 93) Q57. [Fe (CN)6]4− [Fe (CN)6]3− [Ti (CN)6]3− [Ni (CN)4]2− [Co (CN)6]3− Among the given complexes, number of paramagnetic complexes is

Q56.The vapour pressures of two volatile liquids A and B at 25 °C are 50 Torr and 100 Torr, respectively. If the liquid mixture contains 0. 3 mole fraction of A, then the mole fraction of liquid B in the vapour phase is 17x . The value of x is

Q56.At 345 K, the half life for the decomposition of a sample of a gaseous compound initially at 55 . 5 kPa was 340 s. When the pressure was 27 . 8 kPa, the half life was found to be 170 s. The order of the reaction is - [integer answer]

Q56.At 298 K, the equilibrium constant is 2 × 1015 for the reaction: Cu(s) + 2 Ag+(aq) ⇌Cu2+(aq) + 2 Ag(s) The equilibrium constant for the reaction 2 1 Cu2+(aq) + Ag(s) ⇌12 Cu(s) + Ag+(aq) is x × 10−8 . The value of x is ______. (Round off the answer to the nearest integer) JEE Main 2022 (26 Jul Shift 1) JEE Main Previous Year Paper

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

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 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 )