Practice Questions

Q33.Group- 13 elements react with O2 in amorphous form to form oxides of type M2O3 ( M = element). Which among the following is the most basic oxide? (1) Al2 O3 (2) B2O3 (3) Tl2 O3 (4) Ga2 O3

Q33.The correct order of electronegativity for given elements is (1) P > Br > C > At (2) Br > P > At > C (3) Br > C > At > P (4) C > P > At > Br

Q33.The compound which does not exist is (1) NaO2 (2) BeH2 (3) PbEt4 (4) NH42BeF4

Q34.The number of statement's, which are correct with respect to the compression of carbon dioxide from point (a) in the Andrews isotherm from the following is _________. JEE Main 2023 (24 Jan Shift 2) JEE Main Previous Year Paper A. Carbon dioxide remains as a gas upto point (b) B. Liquid carbon dioxide appears at point (c) C. Liquid and gaseous carbon dioxide coexist between points (b) and (c) D. As the volume decreases from (b) to (c), the amount of liquid decreases

Q34.Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason R. Assertion A: Loss of electron from hydrogen atom results in nucleus of ~1 . 5 × 10 – 3 pm size. Reason R: Proton H+ always exists in combined form. In the light of the above statements, choose the most appropriate answer from the options given below: (1) Both A and R are correct and R is the correct (2) A is correct but R is not correct explanation of A (3) A is not correct but R is correct (4) Both A and R are correct but R is NOT the correct explanation of A

Q34.During water-gas shift reaction (1) Carbon monoxide is oxidized to carbon dioxide. (2) Water is evaporated in presence of catalyst. (3) Carbon is oxidized to carbon monoxide. (4) Carbon dioxide is reduced to carbon monoxide.

Q34.For elements B, C, N Li, Be, O and F, the correct order of first ionisation enthalpy is (1) Li < Be < B < C < O < N < F (2) B < Li < Be < C < N < O < F (3) Li < Be < B < C < N < O < F (4) Li < B < Be < C < O < N < F

Q34.The bond order and magnetic property of acetylide ion are same as that of (1) O2+ (2) N2+ (3) NO+ (4) O2−

Q34.H2O2 acts as a reducing agent in (1) 2NaOCl + H2O2 →2NaCl + H2O + O2 (2) 2Fe2 + + 2H+ + H2O2 →2Fe3 + + 2H2O (3) Mn2 + + 2H2O2 →MnO2 + 2H2O (4) Na2 S + 4H2O2 →Na2SO4 + 4H2O

Q34.The enthalpy change for the adsorption process and micelle formation respectively are (1) ΔHads > 0 and ΔHmic < 0 (2) ΔHads > 0 and ΔHmic > 0 (3) ΔHads < 0 and ΔHmic > 0 (4) ΔHads < 0 and ΔHmic < 0

Q34.The correct order of metallic character is (1) K > Be > Ca (2) Be > Ca > K (3) Ca > K > Be (4) K > Ca > Be

Q34.The number of species trom the following carrying a single lone pair on central atom Xenon is XeF+5 , XeO3, XeO2 F2, XeF−5 , XeO3 F2, XeOF4, XeF4

Q34.Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): The first ionization enthalpy of 3d series elements is more than that of group 2 metals Reason (R): In 3d series of elements successive filling of d-orbitals takes place. In the light of the above statements, choose the correct answer from the options given below: (1) Both (A) and (R) are true and (R) is the correct (2) (A) is true but (R) is false explanation of (A) (3) (A) is false but (R) is true (4) Both (A) and (R) are true but (R) is not the correct explanation of (A)

Q34.In which of the following processes, the bond order increases and paramagnetic character changes to diamagnetic one? (1) O2 →O+2 (2) O2 →O2−2 (3) NO →NO+ (4) N2 →N+2 JEE Main 2023 (13 Apr Shift 1) JEE Main Previous Year Paper

Q34.Given below are two statements : One is labelled as Assertion A and the other is labelled as Reason R. Assertion A : Butan– 1–ol has higher boiling point than ethoxyethane. Reason R : Extensive hydrogen bonding leads to stronger association of molecules. 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) Both A and R are true and R is the correct explanation of A (3) Both A and R are true but R is not the correct (4) A is false but R is true explanation of A

Q34.What happens when methane undergoes combustion in systems A and B respectively? (1) System A System B (2) System A System B Temperature rises Temperature remainsTemperaturesame remains same Temperature rises (3) System A System B (4) System A System B Temperature falls Temperature remainsTemperaturesame falls Temperature rises

Q34.The alkaline earth metal sulphate(s) which are readily soluble in water is/are: (A) BeSO4 (B) MgSO4 (C) CaSO4 (D) SrSO4 (E) BaSO4 Choose the correct answer from the options given below: (1) A only (2) B only (3) A and B (4) B and C

Q34.For 1 mol of gas, the plot of pV vs p is shown below. p is the pressure and V is the volume of the gas. JEE Main 2023 (29 Jan Shift 1) JEE Main Previous Year Paper What is the value of compressibility factor at point A ? (1) 1 − RTVa (2) 1 + Vb (3) 1 −bV (4) 1 + RTVa

Q34.Which one of the following pairs is an example of polar molecular solids? (1) SO2( s), CO2( s) (2) SO2( s), NH3( s) (3) MgO(s), SO2(s) (4) HCl(s), AlN(s)

Q34.Resonance in carbonate ion CO32 - is Which of the following is true? (1) It is possible to identify each structure (2) All these structures are in dynamic equilibrium individually by some physical or chemical with each other. method. (3) Each structure exists for equal amount of time. (4) CO32 - has a single structure i.e., resonance hybrid of the above three structures.

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 .

Q34.Which of the following relations are correct? (A) ΔU = q + pΔV (B) ΔG = ΔH −TΔS (C) ΔS = qrevT (D) ΔH = ΔU −ΔnRT Choose the most appropriate answer from the options given below : (1) C and D only (2) B and C only (3) A and B only (4) B and D only

Q34.Match Column I with Column II Column I Column II A Soda ash I CaSO4 B Chlorophyll II CaOH2 C Used in Whitewashing III Na2CO3 D Dentistry, ornamental work IV Mg2 + ions (1) A – III, B – IV, C – I, D – II (2) A – II, B – I, C – III, D – IV (3) A – III, B – I, C – II, D – IV (4) A – II, B – III, C – IV, D – I

Q34.The number of species having a square planar shape from the following is XeF4, SF4, SiF4, BF4−, BrF4−, [Cu (NH3)4]2+, [FeCl4]2−, [PtCl4]2−

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 )