Practice Questions

Q37.Millimoles of calcium hydroxyide required to produce 100 mL of the aqueous solution of pH 12 is x × 10−1 . The value of x is _____ (Nearest integer). Assume complete dissociation.

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.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.

Q37.The possibility of photochemical smog formation is more at (1) Marshy lands (2) Industrial areas (3) Himalayan villages in winter (4) The places with healthy vegetation JEE Main 2023 (06 Apr Shift 1) JEE Main Previous Year Paper

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.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.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.One mole of an ideal gas at 350 K is in a 2. 0 L vessel of thermally conducting walls, which are in contact with the surroundings. It undergoes isothermal reversible expansion from 2. 0 L to 3. 0 L against a constant pressure of 4 atm. The change in entropy of the surroundings (ΔS) is _____ J K–1 (Nearest integer) Given: R = 8. 314 J K−1 mol−1 . JEE Main 2023 (12 Apr Shift 1) JEE Main Previous Year Paper

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.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.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.Which of the following is true about freons? (1) These are chlorofluorocarbon compounds (2) These are chemicals causing skin cancer (3) These are radicals of chlorine and chlorine (4) All radicals are called freons monoxide

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.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. 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.Lime reacts exothermally with water to give ‘A’ which has low solubility in water. Aqueous solution of ‘A’ is often used for the test of CO2, a test in which insoluble B is formed. If B is further reacted with CO2 then soluble compound is formed. ‘A' is (1) Quick lime (2) Slaked lime (3) White lime (4) Lime water

Q37.Number of water molecules in washing soda and soda ash respectively are : JEE Main 2023 (10 Apr Shift 2) JEE Main Previous Year Paper (1) 1 and 10 (2) 10 and 1 (3) 10 and 0 (4) 1 and 0

Q38.Which hydride among the following is less stable? (1) BeH2 (2) HF (3) NH3 (4) LiH

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.Which of the given compounds can enhance the efficiency of hydrogen storage tank? (1) Li /P4 (2) SiH4 (3) NaNi5 (4) Di-isobutylaluminium hydride

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

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