Practice Questions

Q37.Which one of the following statements is correct for electrolysis of brine solution? (1) Cl2 is formed at cathode (2) O2 is formed at cathode (3) H2 is formed at anode (4) OH-is formed at cathode

Q37.A certain quantity of real gas occupies a volume of 0. 15 dm3 at 100 atm and 500 K when its compressibility factor is 1. 07. Its volume at 300 atm and 300 K (When its compressibility factor is 1. 4) is ______ × 10−4 dm3 (Nearest integer)

Q37.Incorrect statement for the use of indicator in acid-base titration is: JEE Main 2023 (31 Jan Shift 2) JEE Main Previous Year Paper (1) Methyl orange may be used for a weak acid vs (2) Phenolphthalein may be used for a strong acid vs weak bas titration. strong base titration. (3) Methyl orange is a suitable indicator for a strong (4) Phenolphthalein is a suitable indicator for a weak acid vs weak base titration. acid vs strong base titration.

Q37.Choose the correct representation of conductometric titration of benzoic acid vs sodium hydroxide. JEE Main 2023 (24 Jan Shift 2) JEE Main Previous Year Paper (1) (2) (3) (4)

Q37.When a 60 W electric heater is immersed in a gas for 100 s in a constant volume container with adiabatic walls, the temperature of the gas rises by 5°C. The heat capacity of the given gas is JK−1 (Nearest integer) JEE Main 2023 (08 Apr Shift 1) JEE Main Previous Year Paper

Q37.What is the correct order of acidity of the protons marked 𝐴– 𝐷 in the given compounds? (1) HC > HD > HB > HA (2) HC > HD > HA > HB (3) HD > HC > HB > HA (4) HC > HA > HD > HB

Q37.The equilibrium composition for the reaction PCl3 + Cl2 ⇌PCl5 at 298 K is given below: [PCl3]eq = 0. 2 mol L−1, [Cl2]eq = 0. 1 mol L−1, [PCl5]eq = 0. 40 mol L−1 If 0. 2 mol of Cl2 is added at the same temperature, the equilibrium concentrations of PCl5 is _____ ×10–2 mol L–1 Given: Kc for the reaction at 298 K is 20

Q37.An indicator ‘ X’ is used for studying the effect of variation in concentration of iodide on the rate of reaction of iodide ion with H2O2 at room temp. The indicator ‘ X’ forms blue colored complex with compound ‘ A’ present in the solution. The indicator ‘ X’ and compound ‘ A’ respectively are (1) Starch and iodine (2) Methyl orange and H2O2 (3) Starch and H2O2 (4) Methyl orange and iodine

Q37.Chlorides of which metal are soluble in organic solvents: (1) Ca (2) Mg (3) K (4) Be JEE Main 2023 (30 Jan Shift 2) JEE Main Previous Year Paper

Q37. O −O bond length in H2O2 is X than the O −O bond length in F2O2 . The O −H bond length in H2O2 is Y ¯¯ than that of the O −F bond in F2O2 . Choose the correct option for X and Y from the given below. ¯¯ (1) X - shorter, Y− shorter (2) X -shorter, Y -longer (3) X -longer, Y -longer (4) X-longer, Y - shorter

Q37.The incorrect statements from the following is: A. The electrical work that a reaction can perform at constant pressure and temperature is equal to the reaction Gibbs energy. B. E∘cell is dependent on the pressure. ° ΔrS° C. dE cell = dT nF D. A cell is operating reversibly if the cell potential is exactly balanced by an opposing source of potential difference. JEE Main 2023 (08 Apr Shift 2) JEE Main Previous Year Paper

Q37.Which of the following represents the lattice structure of A0 . 95O containing A2 + , A3 + and O2 – ions? A. JEE Main 2023 (01 Feb Shift 1) JEE Main Previous Year Paper B. C. (1) B and C only (2) B only (3) A and B only (4) A only

Q37. Where Nu = Nucleophile Find out the correct statement from the options given below for the above two reactions. JEE Main 2023 (11 Apr Shift 1) JEE Main Previous Year Paper (1) Reaction (I) is of 2nd order and reaction (II) is of (2) Reactions (I) and (II) both are of 2nd order 1st order (3) Reactions (I) is of 1st order and reaction (II) is of (4) Reaction (I) and (II) both are of 1st order 2 nd order

Q37.Which of the following statement is correct for paper chromatography? (1) Water present in the pores of the paper forms the (2) Paper sheet forms the stationary phase. stationary phase. (3) Water present in the mobile phase gets absorbed (4) Paper and water present in its pores together by the paper which then forms the stationary form the stationary phase. phase.

Q37.The major product for the following reaction is : JEE Main 2023 (13 Apr Shift 2) JEE Main Previous Year Paper (1) (2) (3) (4)

Q38.In sulphur estimation. 0. 471 g of an organic compound gave 1. 4439 g of barium sulphate. The percentage of sulphur in the compound is _______(Nearest Integer) (Given: Atomic mass Ba: 137u : S : 32u, O : 16u )

Q38.Adding surfactants in non polar solvent, the micelles structure will look like (a) (b) JEE Main 2023 (31 Jan Shift 1) JEE Main Previous Year Paper (c) (d) (1) b (2) c (3) a (4) d

Q38. A2 + B2 →2 AB. ΔHf = −200 kJ mol−1 AB, A2 and B2 are diatomic molecules. If the bond enthalpies of A2, B2 and AB are in the ratio 1 : 0. 5 : 1, then the bond enthalpy of A2 is _________kJ mol–1 (Nearest integer) Q39. 25. 0 mL of 0. 050 M Ba (NO3)2 is mixed with 25. 0 mL of 0. 020 M NaF. Ksp of BaF2 is 0. 5 × 10–6 at 298K. The ratio of [Ba2+][F−]2 and Ksp is ______.

Q38.The major products ‘A’ and ‘B’, respectively, are (1) (2) (3) (4)

Q38.In which of the following reactions the hydrogen peroxide acts as a reducing agent? (1) PbS + 4H2O2 →PbSO4 + 4H2O (2) 2 Fe2+ + H2O2 →2 Fe3+ + 2 OH− (3) HOCl + H2O2 →H3O+ + Cl−1 + O2 (4) Mn2+ + H2O2 →Mn4+ + 2 OH−

Q38.At 298 K, the solubility of silver chloride in water is 1. 434 × 10−3 g L−1 . The value of −logKsp for silver chloride is (Given mass of Ag is 107. 9 g mol−1 , and mass of Cl is 35. 5 g mol−1 )

Q38.In the depression of freezing point experiment A. Vapour pressure of the solution is less than that of pure solvent B. Vapour pressure of the solution is more than that of pure solvent C. Only solute molecules solidify at the freezing point D. Only solvent molecules solidify at the freezing point (1) A and D only (2) B and C only (3) A and C only (4) A only

Q38.Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason R. Assertion A : Order of acidic nature of the following compounds is A > B > C. Reason R: Fluoro is a stronger electron withdrawing group than Chloro group. In the light of the above statements, choose the correct answer from the options given below : (1) A is false but R is true (2) Both A and R are correct and R is the correct explanation of A (3) A is true but R is false (4) Both A and R are correct but R is NOT the correct explanation of A

Q38.The starting material for convenient preparation of deuterated hydrogen peroxide (D2O2) in laboratory is: (1) K2 S2O8 (2) 2-ethylanthraquinol (3) BaO2 (4) BaO

Q38.The titration curve of weak acid vs. strong base with phenolphthalein as indicator is shown below. The Kphenolphthalein = 4 × 10−10 Given: log 2 = 0. 3 The number of following statement/s which is/are correct about phenolphthalein is _______ A. It can be used as an indicator for the titration of weak acid with weak base. B. It begins to change colour at pH = 8. 4 C. It is a weak organic base D. It is colourless in acidic medium Q39. 2 IO−3 + xI−+ 12H+ →6I2 + 6H2 What is the value of x ? (1) 2 (2) 12 (3) 10 (4) 6