Practice Questions

Q32.If the radius of the 3nd Bohr's orbit of hydrogen atom is r3 and the radius of 4th Bohr's orbit is r4 . Then (1) r4 = 169 r3 (2) r4 = 169 r3 (3) r4 = 34 r3 (4) r4 = 34 r3

Q32.The energy of one mole of photons of radiation of wavelength 300 nm is (Given : h = 6. 63 × 10−34 J s, NA = 6. 02 × 1023 mol−1c = 3 × 108 m s−1 ) (1) 235 kJ mol−1 (2) 325 kJ mol−1 (3) 399 kJ mol−1 (4) 435 kJ mol−1

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

Q32.Match List - I with List - II. List-I List-II (Compound) (Shape) A BrF5 I bent B [CrF6]3− II square pyramidal C O3 III trigonal bipyramidal D PCl5 IV octahedral Choose the correct answer from the options given below (1) (A) −(I), (B) −(II), (C) −(III), (D) −(IV) (2) (A) −(IV), (B) −(III), (C) −(II), (D) −(I) (3) (A) −(II), (B) −(IV ), (C) −(I), (D) −(III) (4) (A) −(III), (B) −(IV), (C) −(II), (D) −(I)

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.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.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.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.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.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.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.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.Which of the following statements are correct? (A) The electronic configuration of Cr is [Ar] 3d54s1 . (B) The magnetic quantum number may have a negative value. (C) In the ground state of an atom, the orbitals are filled in order of their increasing energy order. (D) The total number of nodes are given by n −2. Choose the most appropriate answer from the options given below. (1) (A), (C) & (D) only (2) (A) & (B) only (3) (A) & (C) only (4) (A), (B) & (C) only

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.The correct decreasing order for metallic character is (1) Na > Mg > Be > Si > P (2) P > Si > Be > Mg > Na (3) Si > P > Be > Na > Mg (4) Be > Na > Mg > Si > P JEE Main 2022 (28 Jul Shift 2) JEE Main Previous Year Paper

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

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.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

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

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