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

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.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.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.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.Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason R Assertion A:- The alkali metals and their salts impart characteristic colour to reducing flame. Reason R:- Alkali metals can be detected using flame tests. In the light of the above statements, choose the most appropriate answer form the options given below (1) Both A and R are correct but R is NOT the (2) A is correct but R is not correct. correct explanation of A. (3) A is not correct but R is correct (4) Both A and R are correct and R is the correct explanation of A.

Q38.Which of the following reaction is correct? (1) Δ (2) Δ 2 LiNO3 →2 LiNO2 + O2 4 LiNO3 →2 Li2 O + 2N2O4 + O2 (3) Δ (4) Δ 4 LiNO3 →2 Li2 O + 4 NO2 + O2 2 LiNO3 →2Li + 2 NO2 + O2

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

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.Decreasing order of reactivity towards electrophilic substitution for the following compounds is: (1) d > a > e > c > b (2) e > d > a > b > c (3) a > d > e > b > c (4) c > b > a > d > e

Q38.Given below are two statements: Statement-I : Methyl orange is a weak acid. Statement-II : The benzenoid form of methyl orange is more intense/deeply coloured than the quinonoid form. In the light of the above statement, choose the most appropriate answer from the options given below: (1) Both Statement-I and Statement-II are incorrect(2) Statement-I is incorrect but Statement-II is correct (3) Both Statement-I and Statement-II are correct (4) Statement-I is correct but Statement-II is incorrect

Q38.On heating, LiNO3 gives how many compounds among the following? Li2 O, N2, O2, LiNO2, NO2

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.During the reaction of permanganate with thiosulphate, the change in oxidation of manganese occurs by value of 3. Identify which of the below medium will favour the reaction. (1) Both aqueous acidic and neutral (2) Aqueous neutral (3) Both aqueous acidic and faintly alkaline (4) Aqueous acidic

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.Given below are two statements: One is labelled as Assertion A and the other is labelled as Reason R. Assertion A: Amongst He, Ne, Ar and Kr; 1 g of activated charcoal adsorbs more of Kr. Reason R: The critical volume Vc (cm3 mol – 1 ) and critical pressure Pc (atm) is highest for Krypton but the compressibility factor at critical point Zc is lowest for Krypton. In the light of the above statements, choose the correct answer from the options given below. (1) A is true but R is false (2) A is false but R is true (3) Both A and R are true but R is NOT the correct (4) Both A and R are true and R is the correct explanation of A explanation A

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

Q38.A compound is formed by two elements X and Y . The element Y forms cubic close packed arrangement and those of element X occupy one third of the tetrahedral voids. What is the formula of the compound? (1) X2Y3 (2) X3Y2 (3) X3Y (4) XY3