Practice Questions

Q32.Given below are two statements : one is labelled as Assertion A and the other is labelled as Reason R : Assertion A: In the photoelectric effect, the electrons are ejected from the metal surface as soon as the beam of light of frequency greater than threshold frequency strikes the surface. Reason R : When the photon of any energy strikes an electron in the atom, transfer of energy from the photon to the electron takes place. 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) Both A and R are correct but R is NOT the (4) A is not correct but R is correct correct explanation of A JEE Main 2023 (11 Apr Shift 1) JEE Main Previous Year Paper

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

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

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.For OF2 molecule consider the following: (A) Number of lone pairs on oxygen is 2. (B) FOF angle is less than 104 . 5°. (C) Oxidation state of O is -2. (D) Molecule is bent 'V' shaped. (E) Molecular geometry is linear. Correct options are: (1) C, D, E only (2) B, E, A only (3) A, C, D only (4) A, B, D only

Q32.Match List-I with List-II List-I List-II A 16 g of CH4 ( g ) I Weighs 28g B 1 g of H2 ( g ) II 60 . 2 × 1023 electrons C 1 mole of N2 ( g ) III Weighs 32g D 0 . 5 mol of SO2 ( g ) IV Occupies11 . 4 L volume at STP Choose the correct answer from the options given below: JEE Main 2023 (10 Apr Shift 2) JEE Main Previous Year Paper (1) A-II, B-III, C-IV, D-I (2) A-II, B-IV, C-I, D-III (3) A-I, B-III, C-II, D-IV (4) A-II, B-IV, C-III, D-I

Q32.The volume of hydrogen liberated at STP by treating 2. 4 g of magnesium with excess of hydrochloric acid is ...... ×10−2 L. Given Molar volume of gas is 22. 4 L at STP. Molar mass of magnesium is 24 g mol−1

Q32.The correct increasing order of the ionic radii is (1) Cl- < Ca2 + < K+ < S2 - (2) K+ < S2 - < Ca2 + < Cl- (3) S2 - < Cl- < Ca2 + < K+ (4) Ca2 + < K+ < Cl- < S2 -

Q32.Assume carbon burns according to following equation : 2C(s) + O2( g) →2 CO (s) when 12 g carbon is burnt in 48 g of oxygen, the volume of carbon monoxide produced is ______ × 10−1 L at STP [nearest integer] [Given : Assume CO as ideal gas, Mass of C is 12 g mol−1 , mass of O is 16 g mol−1 and molar volume of an idal gas at STP is 22. 7 L mol−1 ]

Q32.What is the number of unpaired electron(s) in the highest occupied molecular orbital of the following species : N2, N +2 , O2, O+2 ? (1) 0, 1, 2, 1 (2) 2, 1, 2, 1 (3) 0, 1, 0, 1 (4) 2, 1, 0, 1

Q32.Consider the following statement (A) NF3 molecules has a trigonal planar structure. (B) Bond Length of N2 is shorter than O2 . (C) Isoelectronic molecules or ions have identical bond order. (D) Dipole moment of H2S is higher than that of water molecule. Choose the correct answer from the options given below: (1) (A) and (B) are correct (2) (A) and (D) are correct (3) (C) and (D) are correct (4) (B) and (C) are correct

Q32.Which one of the following elements will remain as liquid inside pure boiling water? JEE Main 2023 (06 Apr Shift 2) JEE Main Previous Year Paper (1) Ga (2) Br (3) Li (4) Cs

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.Given below are two statements: Statement I: The decrease in first ionization enthalpy from B to Al is much larger than that from Al to Ga. Statement II: The d orbitals in Ga are completely filled. In the light of the above statements, choose the most appropriate answer from the options given below JEE Main 2023 (29 Jan Shift 2) JEE Main Previous Year Paper (1) Statement I is incorrect but statement II is (2) Both the statements I and II are correct correct. (3) Statement I is correct but statement II is incorrect (4) Both the statements I and II are incorrect

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

Q33.The number of atomic orbitals from the following having 5 radial nodes is 7s, 7p, 6s, 8p, 8d

Q33.The number of molecules or ions from the following, which do not have odd number of electrons are _____ . (A) NO2 (B) ICl−4 (C) BrF3 (D) ClO2 (E) NO+2 (F) NO

Q33.For electron gain enthalpies of the elements denoted as ΔegH , the incorrect option is : (1) ΔegH(Cl) < ΔegH(F) (2) ΔegH(Se) < ΔegH(S) (3) ΔegH(I) < ΔegH(At) (4) ΔegH(Te) < ΔegH(Po) Q34. 0. 3 g of ethane undergoes combustion at 27°C in a bomb calorimeter. The temperature of calorimeter system (including the water) is found to rise by 0. 5°C . The heat evolved during combustion of ethane at constant pressure is kJmol−1 . (Nearest integer) [Given : The heat capacity of the calorimeter system is 20 kJ K−1, R = 8. 3 JK−1 mol−1 . Assume ideal gas behaviour. Assume ideal gas behaviour. Atomic mass of C and H are 12 and 1 g mol−1 respectively]

Q33.Which of the following statements are not correct? A. The electron gain enthalpy of F is more negative than that of Cl. B. Ionization enthalpy decreases in a group of periodic table. C. The electronegativity of an atom depends upon the atoms bonded to it. D. Al2 O3 and NO are examples of amphoteric oxides. Choose the most appropriate answer from the options given below: (1) A, B, C and D (2) A, B and D only (3) B and D only (4) A, C and D only

Q33.Order of Covalent bond; A. KF > KI; LiF > KF B. KF < KI; LiF > KF C. SnCl4 > SnCl2; CuCl > NaCl D. LiF > KF; CuCl > NaCl E. KF < KI; CuCl > NaCl (1) C, E Only (2) B, C Only (3) B, C, E Only (4) A, B Only

Q33.Given below are two statements : Statement I : SO2 and H2O both possess V-shaped structure Statement II : The bond angle of SO2 is less than that of H2O. 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 incorrect (2) Both Statement I and Statement II are correct (3) Statement I is incorrect but Statement II is correct(4) Statement I is correct but Statement II is incorrect

Q33.For compound having the formula GaAlCl4, the correct option from the following is (1) Ga is coordinated with CI in GaAlCl4 (2) Ga is more electronegative than AI and is present as a cationic part of the salt GaAlCl4 (3) CI forms bond with both AI and Ga in GaAlCl4 (4) Oxidation state of Ga in the salt GaAlCl4 is + 3

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.A litre of buffer solution contains 0. 1 mole of each of NH3 and NH4 Cl. On the addition of 0. 02 mole of HCl by dissolving gaseous HCl , the pH of the solution is found to be _____ × 10−3 (Nearest integer) Given: pKb(NH3) = 4. 745 log 2 = 0. 301 log 3 = 0. 477 T = 298 K]

Q33.Match List I with List II List II List I (No. of lone pairs of e- (molecules/ions) on central atom) (A) IF7 I. Three (B) ICl4- II. One (C) XeF6 III. Two (D) XeF2 IV. Zero Choose the correct answer from the options given below: (1) A - II, B - III, C - IV, D - I (2) A - IV, B - III, C - II, D - I (3) A - II, B - I, C - IV, D - III (4) A - IV, B - I, C - II, D - III