Practice Questions

Q32.Given below are two statements. One is labelled as Assertion A and the other is labelled as Reason R. Assertion A : Energy of 2 s orbital of hydrogen atom is greater than that of 2 s orbital of lithium. Reason R : Energies of the orbitals in the same subshell decrease with increase in the atomic number. 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.

Q32.Which of the following is a metalloid? (1) Sc (2) Pb (3) Bi (4) Te

Q32.Bonding in which of the following diatomic molecule(s) become(s) stronger, on the basis of MO Theory, by removal of an electron? (A) NO (B) N2 (C) O2 (D) C2 (E) B2 Choose the most appropriate answer from the options given below : (1) A, B, C only (2) B, C, E only (3) A, C only (4) D only JEE Main 2022 (25 Jun Shift 1) JEE Main Previous Year Paper

Q32.What is the correct oder of electron gain enthalpy of Cl, F, Te, Po (1) F > Cl > Te > Po (2) Cl > F > Te > Po (3) Te > Po > Cl > F (4) Po > Te > F > Cl

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.Cs + O2g →CO2g + 400 kJ 1 Cs + 2O2g →COg + 100 kJ When coal of purity 60% is allowed to burn in presence of insufficient oxygen, 60% of carbon is converted into ' CO' and the remaining is converted into 'CO2'. The heat generated when 0 . 6 kg of coal is burnt is (1) 1600 kJ (2) 3200 kJ (3) 4400 kJ (4) 6600 kJ

Q32.Which of the following sets of quantum numbers is not allowed? JEE Main 2022 (25 Jul Shift 1) JEE Main Previous Year Paper 1 1 (1) n = 3, l = 2, ml = 0, s = + 2 (2) n = 3, l = 2, ml = - 2, s = + 2 (3) n = 3, l = 3, ml = - 3, s = - 1 (4) n = 3, l = 0, ml = 0, s = - 1 2 2

Q32.Outermost electronic configurations of four elements A, B, C, D are given below: (A) 3 s2 (B) 3s23p1 (C) 3 s23p3 (D) 3 s23p4 The correct order of first ionization enthalpy for them is (1) A < B < C < D (2) B < A < D < C (3) B < D < A < C (4) B < A < C < D

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

Q32.Identify the incorrect statement for PCl5 from the following. (1) In this molecule, orbitals of phosphorous are (2) The geometry of PCl5 is trigonal bipyramidal. assumed to undergo sp3 d hybridization. (3) PCl5 has two axial bonds stronger than three (4) The three equatorial bonds of PCl5 lie in a plane. equatorial bonds.

Q32.In which of the following pairs, electron gain enthalpies of constituent elements are nearly the same or identical? (A) Rb and Cs (B) Na and K (C) Ar and Kr (D) I and At Choose the correct answer from the options given below (1) A & B only (2) B & C only (3) A & C only (4) C & D only

Q32.The metal that has very low melting point and its periodic position is closer to a metalloid is (1) Al (2) Ga (3) Se (4) In

Q32.The first ionization enthalpy of Na, Mg and Si, respectively, are: 496, 737 and 786 kJ mo 1−1 . The first ionization enthalpy (kJmol−1) of Al is (1) 487 (2) 768 (3) 577 (4) 856

Q32.Which one of the following techniques is not used to spot components of a mixture separated on thin layer chromatographic plate? (1) I2 (Solid) (2) U.V. Light (3) Visualisation agent as a component of mobile (4) Spraying of an appropriate reagent phase

Q32.Consider the following pairs of electrons (A) (a) n = 3, l = 1, ml = 1, ms = + 12 (b) n = 3, l = 2, ml = 1, ms = + 21 (B) (a) n = 3, l = 2, ml = −2, ms = −12 (b) n = 3, l = 2, ml = −1, ms = −12 (C) (a) n = 4, l = 2, ml = 2, ms = + 21 (b) n = 3, l = 2, ml = 2, ms = + 21 The pairs of electrons present in degenerate orbitals is/are (1) Only (A) (2) Only (B) (3) Only (C) (4) (B) and (C) both

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.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 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.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.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.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.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.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