Practice Questions

Q34.The density of a monobasic strong acid (Molar mass 24. 2 g mol) is 1. 21 kg L . The volume of its solution required for the complete neutralization of 25 mL of 0. 24 M NaOH is 10−2 mL (Nearest integer) Q35.' 25 volume' hydrogen peroxide means (1) 1 L marketed solution contains 250 g of H2O2 . (2) 1 L marketed solution contains 75 g of H2O2 . (3) 100 mL marketed solution contains 25 g of (4) 1 L marketed solution contains 25 g of H2O2 . H2O2 .

Q35.At 298 K N2(g) + 3H2(g) ⇌2 NH3(g), K1 = 4 × 105 N2(g) + O2(g) ⇌2 NO(g), K2 = 1. 6 × 1012 H2(g) + 12 O2(g) ⇌H2O(g), K3 = 1. 0 × 10−13 Based on above equilibria, the equilibrium constant of the reaction, 2 NH3(g) + 25 O2( g) ⇌2 NO(g) + 3H2O(g) is _____ ×10−33 (Nearest integer)

Q35.Consider the following reaction approaching equilibrium at 27°C and 1 atm pressure Kt=03 A + B ⇌ C + D Kr=102 The standard Gibb's energy change (ΔrG°) at 27°C is (−) _____ kJmol−1 (Nearest integer). (Given : R = 8. 3J K−1 mol−1 and ln 10 = 2. 3 )

Q35.The maximum number of lone pairs of electron on the central atom from the following species is ...... ClO3−, XeF4, SF4 and l3−

Q35.The number of following factors which affect the percent covalent character of the ionic bond is______ A) Polarising power of cation B) Extent of distortion of anion C) Polarisability of the anion D) Polarising power of anion

Q35.The effect of addition of helium gas to the following reaction in equilibrium state at constant volume, is : PCI5( g) ⇌PCl3( g) + Cl2( g) JEE Main 2023 (01 Feb Shift 2) JEE Main Previous Year Paper (1) the equilibrium will shift in the forward direction (2) the equilibrium will go backward due to and more of Cl2 and PCl3 gases will be suppression of dissociation of PCl5 . produced. (3) helium will deactivate PCl5 and reaction will (4) addition of helium will not affect the equilibrium. stop.

Q35.Consider the following equation: 2 SO2(g) + O2(g) ⇌2 SO3(g), ΔH = −190 kJ. The number of factors which will increase the yield of SO3 at equilibrium from the following is _____ . A. Increasing temperature B. Increasing pressure C. Adding more SO2 D. Adding more O2 E. Addition of catalyst

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.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.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

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. Three bulbs are filled with CH4, CO2 and Ne as shown in the picture. The bulbs are connected through pipes of zero volume. When the stopcocks are opened and the temperature is kept constant throughout, the pressure of the system is found to be______ atm. (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.

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.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.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.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

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

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

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

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.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)