Practice Questions

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.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.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.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 ΨMO = ΨA −ΨB I Dipole moment B μ = Q × r II Bonding molecular orbital C Nb−Na III Anti-bonding molecualr orbital 2 D ΨMO = ΨA + ΨB IV Bond order (1) A −II, B −I, C −IV, D −III (2) A −III, B −IV, C −I, D −II (3) A −III, B −I, C −IV, D −II (4) A −III, B −IV, C −II, D −I JEE Main 2022 (27 Jul Shift 2) JEE Main Previous Year Paper

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.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.The IUPAC nomenclature of an element with electronic configuration Rn5f146d17s2 is (1) Unnilunium (2) Unnilbium (3) Unniltrium (4) Unnilquadium Q34.20 mL of 0 . 1M NH4OH is mixed with 40 mL of 0 . 05 M HCl. The pH of the mixture is nearest to: (Given: KbNH4OH = 1 × 10-5, log2 = 0 . 30, log3 = 0 . 48, log5 = 0 . 69, log7 = 0 . 84, log11 = 1 . 04) (1) 3 . 2 (2) 4 . 2 (3) 5 . 2 (4) 6 . 2

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.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.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.Arrange the following in increasing order of their covalent character. (A) CaF2 (B) CaCl2 (C) CaBr2 (D) CaI2 JEE Main 2022 (26 Jul Shift 2) JEE Main Previous Year Paper Choose the correct answer from the options given below. (1) B < A < C < D (2) A < B < C < D (3) A < B < D < C (4) A < C < B < D

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. Ka1, Ka2 and Ka3 are the respective ionization constants for the following reactions (a), (b) and (c). (a) H2C2O4 ⇌H+ + HC2 O−4 (b) HC2 O−4 ⇌H+ + HC2 O2−4 (c) H2C2O4 ⇌2H+ + C2O2−4 The relationship between Ka1, Ka2 and Ka3 is given as (1) Ka3 = Ka1 + Ka2 (2) Ka3 = Ka1 Ka2 (3) Ka3 = Ka1 −Ka2 (4) Ka3 = Ka1 × Ka2

Q34.Arrange the following in the decreasing order of their covalent character : JEE Main 2022 (29 Jun Shift 1) JEE Main Previous Year Paper (A) LiCl (B) NaCl (C) KCl (D) CsCl Choose the most appropriate answer from the options given below (1) (A) > (C) > (B) > (D) (2) (B) > (A) > (C) > (D) (3) (A) > (B) > (C) > (D) (4) (A) > (B) > (D) > (C)

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

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.Consider the species CH4, NH+4 and BH−4 . Choose the correct option with respect to the there species: (1) They are isoelectronic and only two have (2) They are isoelectronic and all have tetrahedral tetrahedral structures structures (3) Only two are isoelectronic and all have (4) Only two are isoelectronic and only two have tetrahedral structures tetrahedral structures

Q34.The correct order of bond orders of C2−2 , N2−2 and O2−2 is (1) C2−2 > N2−2 > O2−2 (2) O2−2 > N2−2 > O2−2 (3) N2−2 > O2−2 > C2−2 (4) C2−2 > O2−2 > N2−2

Q34.In the structure of SF4 , the lone pair of electrons on S is in. (1) Equatorial position and there are two lone pair - (2) equatorial position and there are three lone pair - bond pair repulsions at 90° . bond pair repulsions at 90° . (3) axial position and there are three lone pair - bond (4) axial position and there are two lone pair - bond pair repulsion at 90° . pair repulsion at 90° .

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.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.Number of lone pairs of electrons in the central atom of SCl2, O3, ClF3 and SF6 , respectively, are (1) 0, 1, 2 & 2 (2) 2, 1, 2 & 0 (3) 1, 2, 2 & 0 (4) None of these

Q34.The formula of the purple colour formed in Laissaigne's test for sulphur using sodium nitroprusside is (1) Na4[Fe (CN)5(NOS)] (2) NaFe[Fe (CN)6] (3) Na[Cr (NH3)2(NCS)4] (4) Na2[Fe (CN)5(NO)]