Practice Questions

Q32.Consider the following statements : (A) The principal quantum number ' n ' is a positive integer with values of ' n' = 1, 2, 3, … (B) The azimuthal quantum number ' l ' for a given ' n ' (principal quantum number) can have values as ' l ' = 0, 1, 2, … . n has (2 n + 1) values. (C) Magnetic orbital quantum number ' m ' for a particular ' l ' (azimuthal quantum number) has (2l + 1) values. (D) ± 12 are the two possible orientations of electron spin. (E) For l = 5 , there will be a total of 9 orbital Which of the above statements are correct? (1) (A), (B) & (C) (2) (A), (C), (D)& (E) (3) (A), (C) & (D) (4) (A), (B), (C) & (D)

Q32.Based upon VSEPR theory, match the shape (geometry) of the molecules in List-I with the molecules in List - II and select the most appropriate option. List-I List-II (Shape) (Molecules) A T-shaped I. XeF4 B Trigonal planar II. SF4 C Square planar III. ClF3 D See-saw IV. BF3 (1) (A) −(I), (B) −(II), (C) −(III), (D) −(IV) (2) (A) −(III), (B) −(IV), (C) −(I), (D) −(II) (3) (A) −(III), (B) −(IV), (C) −(II), (D) −(I) (4) (A) −(IV), (B) −(III), (C) −(I), (D) −(II)

Q32.Match List I with List II List-I List-II A XeO3 I sp3 d ; linear B XeF2 II sp3 ; pyramidal C XeOF4 III sp3 d3 ; distorted octahedral D XeF6 IV sp3 d2 ; square pyramidal Choose the correct answer from the options given below (1) A −II, B −IV, C −III, D −I (2) A −IV, B −II, C −III, D −I (3) A −II, B −I, C −IV, D −III (4) A −IV, B −II, C −I, D −III

Q33.Given below are the quantum numbers for 4 electrons. 1 A. n = 3, l = 2, m1 = 1, ms = + 2 1 B. n = 4, l = 1, m1 = 0, ms = + 2 C. n = 4, l = 2, m1 = - 2, ms = - 1 2 1 D. n = 3, l = 1, m1 = - 1, ms = + 2 The correct order of increasing energy is (1) D < B < A < C (2) D < A < B < C (3) B < D < A < C (4) B < D < C < A Q34.200 mL of 0 . 01MHCl is mixed with 400 mL of 0 . 01MH2SO4. The pH of the mixture is (1) 1 . 14 (2) 1 . 78 (3) 2 . 34 (4) 3 . 02

Q33.The oxide which contains an odd electron at the nitrogen atom is (1) N2O (2) NO2 (3) N2O3 (4) N2O5

Q33.The incorrect statement is (1) The first ionization enthalpy of K is less than that (2) Xe does not have the lowest first ionization of Na and Li enthalpy in its group (3) The first ionization enthalpy of element with (4) The first ionization enthalpy of Ga is higher than atomic number 37 is lower than that of the that of the d-block element with atomic number element with atomic number 38 . 30 .

Q33.Which of the following pair of molecules contain odd electron molecule and an expanded octet molecule? (1) BCl3 and SF6 (2) NO and H2 SO4 (3) SF6 and H2 SO4 (4) BCl3 and NO

Q33.Match List - I with List - II. List-I List-II (A) Spontaneous process (I) ΔH < 0 Process with (B) (II) ΔGT,P < 0 ΔP = 0, ΔT = 0 (C) ΔHreaction (III) Isothermal and isobaric process [Bond energies of molecules in reactants] (D) Exothermic Process (IV) - [Bond energies of product molecules] Choose the correct answer from the options given below (1) (A) −(III), (B) −(II), (C) −(IV), (D) −(I) (2) (A) −(II), (B) −(III), (C) −(IV), (D) −(I) (3) (A) −(II), (B) −(III), (C) −(I), (D) −(IV) (4) (A) −(II), (B) −(I), (C) −(III), (D) −(IV)

Q33.The electronic configuration of Pt (atomic number 78 ) is (1) [Kr]4f 145d10 (2) [Xe]4f 145d10 (3) [Xe]4f 145d86s2 (4) [Xe]4f 145d96s1

Q33.Number of electron deficient molecules among the following PH3, B2H6, CCl4, NH3, LiH and BCl3 is (1) 0 (2) 1 (3) 2 (4) 3

Q33.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 for oxygen is lower than that of nitrogen. Reason R : The four electrons in 2p orbitals of oxygen experience more electron-electron repulsion. In the light of the above statements, choose the correct answer from the options given below. (1) Both A and R are correct and R is the correct (2) Both A and R are correct but R is NOT the explanation of A . correct explanation of A . (3) A is correct but R is not correct. (4) A is not correct but R is correct

Q33.Which of the following structures are aromatic in nature? (1) A, B, C & D (2) Only A & B (3) Only A & C (4) Only B, C & D

Q33.Which of the given reactions is not an example of disproportionation reaction? (1) 2H2O2 →2H2O + O2 (2) 2 NO2 + H2O →HNO3 + HNO2 (3) MnO−4 + 4H+ + 3e−→MnO2 + 2H2O (4) 3 MnO4 2−+ 4H+ →2 MnO4 −+ MnO2 + 2H2O

Q33.Given below are two statements : One is labelled as Assertion A and the other is labelled as Reason R Assertion A : Zero orbital overlap is an out of phase overlap. Reason R : It results due to different orientation/ direction of approach of orbitals. 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) Both A and R are true but R is NOT the correct explanation of A explanation of A (3) A is true but R is false (4) A is false but R is true

Q33.The correct order of increasing intermolecular hydrogen bond strength is (1) HCN < H2O < NH3 (2) HCN < CH4 < NH3 (3) CH4 < HCN < NH3 (4) CH4 < NH3 < HCN

Q33.For a reaction at equilibrium A(g) ⇌B(g) + 12 C(g) the relation between dissociation constant (K), degree of dissociation (α) and equilibrium pressure (p) is given by : (1) α 32 p 12 (2) α 12 p 32 K = 1 K = 1 (2+α) 2 (1−α) (1+ 32 α) 2 (1−α) (3) (αp) 32 (4) (αp) 32 K = 1 K = 1 (1+ 32 α) 2 (1−α) (1+α)(1−α) 2

Q33.Consider the ions/molecule O+2 , O2, O−2 , O2−2 . For increasing bond order the correct option is (1) O−2 < O2−2 < O2 < O+2 (2) O−2 < O2−2 < O+2 < O2 (3) O−2 < O+2 < O2−2 < O2 (4) O2 2- < O2 - < O2 < O2 +

Q33.At 25 °C and 1 atm pressure, the enthalpy of combustion of benzene 1 and acetylene g are -3268 kJ mol-1 and -1300 kJ mol-1, respectively. The change in enthalpy for the reaction 3C2H2g →C6H6l, is (1) +324 kJ mol-1 (2) +632 kJ mol-1 (3) -632 kJ mol-1 (4) -732 kJ mol-1

Q33.Metals generally melt at very high temperatures, Among the following which one has the highest melting point? (1) Ga (2) Ag (3) Hg (4) Cs

Q33.Match List-I with List-II List-I List-II (A) Cl2 O7 (I) Amphoteric (B) Na2 O (II) Basic (C) Al2 O3 (III) Neutral (D) N2O (IV) Acidic Choose the correct answer from the options given below JEE Main 2022 (28 Jun Shift 2) JEE Main Previous Year Paper (1) (A) −(IV), (B) −(III), (C) −(I), (D) −(II) (2) (A) −(IV), (B) −(II), (C) −(I), (D) −(III) (3) (A) −(II), (B) −(IV), (C) −(III), (D) −(I) (4) (A) −(I), (B) −(II), (C) −(III), (D) −(IV)

Q34.Which one of the following is an example of disproportionation reaction? (1) 3 MnO2−4 + 4H+ →2 MnO−4 + MnO2 + 2H2O (2) MnO−4 + 4H+ + 4e−→MnO2 + 2H2O (3) 10I−+ 2 MnO−4 + 16H+ →2 Mn2 + +8H2O + (4)5I28 MnO−4 + 3 S2O2−3 + H2O →8 MnO2 + 6 SO2−4 + 2 OH

Q34.Which one of the following alkaline earth metal ions has the highest ionic mobility in its aqueous solution? (1) Sr2 + (2) Mg2 + (3) Ca2 + (4) Be2 +

Q34.An evacuated glass vessel weighs 40. 0 g when empty, 135. 0 g when filled with a liquid of density 0. 95 g mL−1 and 40. 5 g when filled with an ideal gas at 0. 82 atm at 250 K . The molar mass of the gas in gmol−1 is : (Given : R = 0. 082 L atmK−1 mol−1 ) (1) 35 (2) 50 (3) 75 (4) 125

Q34.The Ksp for bismuth sulphide Bi2S3 is 1 . 08 × 10-73. The solubility of Bi2S3 in molL-1 at 298 K is (1) 1 . 0 × 10-15 (2) 2 . 7 × 10-12 (3) 3 . 2 × 10-10 (4) 4 . 2 × 10-8

Q34.In base vs. Acid titration, at the end point methyl orange is present as (1) quinonoid form (2) heterocyclic form (3) phenolic form (4) benzenoid form