Practice Questions

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.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.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.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.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.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.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.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.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.

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

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

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)

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)

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

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

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.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)

Q42.The number of possible isomeric products formed when 3 -chloro- 1 -butene reacts with HCl through carbocation formation is.........

Q42.Testosterone, which is a steroidal hormone, has the following structure. The total number of asymmetric carbon atom/s in testosterone is ____________. Q43. ‘ X ’ is: JEE Main 2023 (01 Feb Shift 2) JEE Main Previous Year Paper (1) (2) (3) (4)

Q42.Molar mass of the hydrocarbon (X) which on ozonolysis consumes one mole of O3 per mole of (X) and gives one mole each of ethanal and propanone is ______ g mol–1 (Molar mass of C : 12 g mol–1 , H : 1 g mol–1 )