Practice Questions

Q32.Match List I with List II (A) Slaked lime (I) NaOH (B) Dead burnt plaster (II) Ca ( OH ) 2 (C) Caustic soda (III) Na2CO3 · 10H2O (D) Washing soda (IV) CaSO4 Choose the correct answer form the options given below: (1) (A) - I, (B) - IV, (C) - II, (D) - III (2) (A) - III, (B) - IV, (C) - II, (D) - I (3) (A) - II, (B) - IV, (C) - I, (D) - III (4) (A) - III, (B) - II, (C) -IV, (D) -I

Q32.The bond dissociation energy is highest for (1) Cl2 (2) I2 (3) Br2 (4) F2

Q32.The total number of lone pairs of electrons on oxygen atoms of ozone is

Q32.The energy of an electron in the first Bohr orbit of hydrogen atom is −2. 18 × 10−18 J Its energy in the third Bohr orbit is _______. (1) 9 1 th of the value (2) 271 of this value (3) Three times of this value (4) One third of this value

Q32.Which of the following options are correct for the reaction? - 2 - 2Au ( CN ) 2 (aq) + Zn(s) →2Au(s) + Zn ( CN ) 4 (aq) A. Redox reaction B. Displacement reaction C. Decomposition reaction D. Combination reaction Choose the correct answer from the options given below: (1) A only (2) A and D only (3) A and B only (4) C and D only

Q32.Maximum number of electrons that can be accommodated in shell with n = 4 are: (1) 16 (2) 32 (3) 50 (4) 72

Q32.The number of given orbitals which have electron density along the axis is px, py, pz, dxy, dyz, dxz, d2z, dx2−y2

Q32.Which one of the following sets of ions represents a collection of isoelectronic species? (Given : Atomic Number : F : 9, Cl : 17, Na = 11 Mg = 12, Al = 13, K = 19, Ca = 20, Sc = 21) (1) (Li+, Na+, Mg2+, Ca2+ (2) (Ba2+, Sr2+, K+, Ca2+ (3) (N3−, O2−, F−, S2− (4) (K+, Cl−, Ca2+, Sc3+

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.Statement I:- Dipole moment is a vector quantity and by convention it is depicted by a small arrow with tail on the negative centre and head pointing towards the positive centre. Statement II:- The crossed arrow of the dipole moment symbolizes the direction of the shift of charges in the molecules. In the light of the above statements, choose the most appropriate answer from the options given below:- (1) Both Statement I and Statement II are correct. (2) Statement I is incorrect but Statement II is correct. (3) Both Statement I and Statement II are incorrect. (4) Statement I is correct but Statement II is incorrect. Q34. 28. 0 L of CO2 is produced on complete combustion of 16. 8 L gaseous mixture of ethene and methane at 25°C and 1 atm. Heat evolved during the combustion process is kJ Given : ΔHC(CH4) = −900 kJ mol−1 ΔHC(C2H4) = −1400 kJ mol−1 .

Q33.Arrange the following orbitals in decreasing order of energy. A. n = 3, l = 0, m = 0 B. n = 4, l = 0, m = 0 C. n = 3, l = 1, m = 0 D. n = 3, l = 2, m = 1 The correct option for the order is: (1) D > B > C > A (2) B > D > C > A (3) A > C > B > D (4) D > B > A > C

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

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.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.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.

Q35.In an ice crystal, each water molecule is hydrogen bonded to _____ neighbouring molecules.

Q35.The setting time of Cement is increased by adding (1) Clay (2) Silica (3) Gypsum (4) Limestone

Q35.Lithium aluminium hydride can be prepared from the reaction of (1) LiCl and Al2H6 (2) LiH and Al2Cl6 (3) LiCl, Al and H2 (4) LiH and AlOH3

Q35.Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason R. Assertion A : Isotopes of hydrogen have almost same chemical properties, but difference in their rates of reactions. Reason R: Isotopes of hydrogen have different enthalpy of bond dissociation. In the light of the above statements, choose the most appropriate answer from the options given below: (1) Both A and R are correct but R is NOT the (2) Both A and R are correct and R is the correct correct explanation of A explanation of A (3) A is not correct but R is correct (4) A is correct but R is not correct

Q36.How can photochemical smog be controlled? (1) By using tall chimneys (2) By complete combustion of fuel (3) By using catalytic converters in (4) By using catalyst the automobiles/industry

Q36.For a good quality cement, the ratio of silica to alumina is found to be (1) 1. 5 (2) 4. 5 (3) 2 (4) 3

Q36.Match List I with List II List I List II A. Cobalt catalyst I. (H2 + Cl2) production B. Syngas II. Water gas production C. Nickel catalyst III. Coal gasification D. Brine solution IV. Methanol production Choose the correct answer from the options given below:- JEE Main 2023 (25 Jan Shift 2) JEE Main Previous Year Paper (1) A-IV, B-I, C-II, D-III (2) A-IV, B-III, C-I, D-II (3) A-II, B-III, C-IV, D-I (4) A-IV, B-III, C-II, D-I