Practice Questions

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.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.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.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.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 : 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.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)

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

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

Q34.Given below are two statements: One is labelled as Assertion A and the other is labelled as Reason R Assertion A : The reduction of a metal oxide is easier if the metal formed is in liquid state than solid state. Reason R : The value of ΔGΘ becomes more on negative side as entropy is higher in liquid state than solid state. 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) 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

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.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.The Plot of pH -metric titration of weak base NH4 OH vs strong acid HCl looks like (1) (2) (3) (4)

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.Given below are two statements. Statement I : O2, Cu2+ and Fe3+ are weakly attracted by magnetic field and are magnetized in the same direction as magnetic field. Statement II : NaCl and H2O are weakly magnetized in opposite direction to magnetic field. In the light of the above statements, choose the most appropriate answer form the options given below (1) Both Statement I and Statement II are correct. (2) Both Statement I and Statement II are incorrect. (3) Statement I is correct but Statement II is (4) Statement I is incorrect but Statement II is incorrect. correct.

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.The metal salts formed during softening of hardwater using Clark's method are (1) CaOH2 and MgOH2 (2) CaCO3 and MgOH2 (3) CaOH2 and MgCO3 (4) CaCO3 and MgCO3