Practice Questions

Q36.The total number of intensive properties from the following is........... Volume, Molar heat capacity, molarity, Eocell ,Gibbs free energy change, Molar mass, Mole Q37. 4. 5 moles each of hydrogen and iodine is heated in a sealed ten litre vessel.At equilibrium, 3 moles of HI were found. The equilibrium constant for H2(g) + I2(g) ⇌2 HI(g) is ........

Q36.The volume of HCl, containing 73g L−1 , required to completely neutralise NaOH obtained by reacting 0. 69 g of metallic sodium with water, is _____ mL. (Nearest Integer) (Given : molar Masses of Na, Cl, O, H are 23, 35. 5, 16 and 1g mol−1 respectively)

Q36.At 600 K, the root mean square (rms) speed of gas X (molar mass = 40) is equal to the most probable speed of gas Y at 90 K. The molar mass of the gas Y is _____ g mol–1 . (Nearest integer)

Q36.Consider the following data Heat of combustion of H2(g) = –241. 8 kJ mol–1 Heat of combustion of C(s) = –393. 5 kJ mol–1 Heat of combustion of C2H5 OH(l)= –1234. 7 kJ mol–1 The heat of formation of C2H5 OH(l) is (–) _____ kJ mol–1 (Nearest integer).

Q36.The strength of 50 volume solution of hydrogen peroxide is _____ g/L (Nearest integer). Given: Molar mass of H2O2 is 34 g mol−1 Molar volume of gas at STP = 22. 7 L.

Q36.Enthalpies of formation of CCl4( g), H2O(g), CO2( g) and HCl are −105, −242, −394 and −92 kJ mol−1 respectively. The magnitude of enthalpy of the reaction given below is kJmol−1 . (nearest integer) CCl4( g) + 2H2O(g) →CO2( g) + 4 HCl(g)

Q36.If the pKa of lactic acid is 5 , then the pH of 0. 005 M calcium lactate solution at 25° C is __________ × 10–1 (Nearest integer)

Q36.Water decomposes at 2300 K H2O(g) →H2(g) + 12 O2(g) The percent of water decomposing at 2300 K and 1 bar is _____ (Nearest integer). Equilibrium constant for the reaction is 2 × 10−3 at 2300 K

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.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.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.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.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.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)

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

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.An analyst wants to convert 1 L HCl of pH = 1 to a solution of HCl of pH = 2. The volume of water needed to do this dilution is _____ mL. (Nearest integer)

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

Q39.The solubility product of BaSO4 is 1 × 10−10 at 298 K. The solubility of BaSO4 in 0. 1M K2 SO4(aq) solution is ------ ×10−9 g L−1 (nearest integer). Given: Molar mass of BaSO4 is 233 g mol−1

Q39.The compound which will have the lowest rate towards nucleophilic aromatic substitution on treatment with OH– is JEE Main 2023 (25 Jan Shift 1) JEE Main Previous Year Paper (1) (2) (3) (4)

Q41.When 0. 01 mol of an organic compound containing 60% carbon was burnt completely, 4. 4 g of CO2 was produced. The molar mass of compound is _____ gmol−1 (Nearest integer)

Q41.The number of alkali metal(s), from Li, K, Cs, Rb having ionization enthalpy greater than 400 kJ mol−1 and forming stable super oxide is

Q41.Compound from the following that will not produce precipitate on reaction with AgNO3 is JEE Main 2023 (11 Apr Shift 2) JEE Main Previous Year Paper (1) (2) (3) (4)

Q41.The number of s-electrons present in an ion with 55 protons in its unipositive state is (1) 8 (2) 9 (3) 12 (4) 10 JEE Main 2023 (24 Jan Shift 2) JEE Main Previous Year Paper