Practice Questions

Q31.Identify the incorrect statement from the following. (1) A circular path around the nucleus in which an (2) An orbital is the one electron wave function electron moves is proposed as Bohr's orbit. (3) The existence of Bohr's orbits is supported by (4) Atomic orbital is characterised by the quantum hydrogen spectrum. numbers n and l only

Q31.Production of iron in blast furnace follows the following equation Fe3 O4(s) + 4 CO(g) →3 Fe(l) + 4 CO2(g) when 4. 640 kg of Fe3 O4 and 2. 520 kg of CO are allowed to react then the amount of iror (in g) produced is : [Given: Molar Atomic mass (gmol−1) : Fe = 56 Molar Atomic mass (gmolm−1) : O = 16 Molar Atomic mass (gmolm−1) : C = 12] (1) 1400 (2) 2200 (3) 3360 (4) 4200

Q31.Which of the following pair is not isoelectronic species? (Atomic numbers Sm = 62; Er = 68; Yb = 70; Lu = 71; Eu = 63; Tb = 65; Tm= 69 ) (1) Sm2+ and Er3+ (2) Yb2+ and Lu3+ (3) Eu2+ and Tb4+ (4) Tb2+ and Tm4+

Q31.The correct decreasing order of energy, for the orbitals having, following set of quantum numbers: (A) n = 3, 1 = 0, m = 0 (B) n = 4, l = 0, m = 0 (C) n = 3, l = 1, m = 0 (D) n = 3, 1 = 2, m = 1 (1) (D) > (B) > (C) > (A) (2) (B) > (D) > (C) > (A) (3) (C) > (B) > (D) > (A) (4) (B) > (C) > (D) > (A)

Q31.The first ionization enthalpies of Be, B, N and O follow the order (1) B < Be < O < N (2) O < N < B < Be (3) Be < B < N < O (4) B < Be < N < O JEE Main 2022 (25 Jul Shift 2) JEE Main Previous Year Paper

Q31.SO2Cl2 on reaction with excess of water results into acidic mixture SO2Cl2 + 2H2O →H2SO4 + 2HCl 16 moles of NaOH is required for the complete neutralisation of the resultant acidic mixture. The number of moles of SO2Cl2 used is (1) 16 (2) 8 (3) 4 (4) 2

Q31.Compound A contains 8. 7% Hydrogen, 74% Carbon and 17. 3% Nitrogen. The molecular formula of the compound is, Given : Atomic masses of C, H and N are 12, 1 and 14 amu respectively. The molar mass of the compound A is 162 g mol−1 . (1) C4H6N2 (2) C2H3N (3) C5H7N (4) C10H14N2

Q31.The minimum energy that must be possessed by photons in order to produce the photoelectric effect with platinum metal is: [Given: The threshold frequency of platinum is 1 . 3 × 1015 s-1 and h = 6 . 6 × 10-34Js] (1) 8 . 58 × 10-19J (2) 9 . 76 × 10-20J (3) 3 . 21 × 10-14J (4) 6 . 24 × 10-16J

Q31.Consider the reaction 4HNO3l + 3KCls →Cl2g + NOClg + 2H2Og + 3KNO3s The amount of HNO3 required to produce110 . 0 g of KNO3 is (Given : Atomic masses of H, O, N and K are 1, 16, 14 and 39, respectively.) (1) 32 . 2 g (2) 69 . 4 g (3) 91 . 5 g (4) 162 . 5 g

Q31.The correct order of ionic size of N3−, Na+, F−, Mg2+ and O2− is : (1) Mg2+ < Na+ < F−< O2−< N3− (2) N3−< O2−< F < Na+ < Mg2+ (3) F−< Na+ < O2−< Mg2+ < N3− (4) Na+ < F−< Mg2+ < O2−< N3−

Q31.If a rocket runs on a fuel (C15H30) and liquid oxygen, the weight of oxygen required and CO2 released for every litre of fuel respectively are : (Given : density of the fuel is 0. 756 g/ mL ) (1) 1188 g and 1296 g (2) 2376 g and 2592 g (3) 2592 g and 2376 g (4) 3429 g and 3142 g

Q31.Given below are two statements : one is labelled as Assertion and the other is labelled as Reason. Assertion: The ionic radii of O2− and Mg2+ are same. JEE Main 2022 (27 Jun Shift 1) JEE Main Previous Year Paper Reason: Both O2− and Mg2+ are isoelectronic species. In the light of the above statements, choose the correct answer from the options given below. (1) Both Assertion and Reason are true and Reason is (2) Both Assertion and Reason are true but Reason is the correct explanation of Assertion. not the correct explanation of Assertion. (3) Assertion is true but Reason is false. (4) Assertion is false but Reason is true.

Q31.The number of radial and angular nodes in 4 d orbital are, respectively (1) 1 & 2 (2) 3 & 2 (3) 1 & 0 (4) 2 & 1

Q31.Hemoglobin contains 0 . 34% of iron by mass. The number of Fe atoms in 3 . 3 g of hemoglobin is (Given : Atomic mass of Fe is 56u, NA in6 . 022 × 1023 mol-1) (1) 1 . 21 × 105 (2) 12 . 0 × 1016 (3) 1 . 21 × 1020 (4) 3 . 4 × 1022

Q31.Given two statements below : Statement I : In Cl2 molecule the covalent radius is double of the atomic radius of chlorine. Statement II : Radius of anionic species is always greater than their parent atomic radius. JEE Main 2022 (26 Jul Shift 1) JEE Main Previous Year Paper Choose the most appropriate answer from 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.

Q31.The pair, in which ions are isoelectronic with Al3 + is (1) Br- and Be2 + (2) Cl- and Li+ (3) S2 - and K+ (4) O2 - and Mg2 +

Q31. N2(g) + 3H2(g) ⇌2 NH3(g) 20 g 5 g Consider the above reaction. If 20g of dinitrogen reacts with 5g of dihydrogen, then the limiting reagent of the reaction and number of moles of NH3 formed respectively are (1) H2, 1. 42 moles (2) H2, 0. 71 moles (3) N2, 1. 42 moles (4) N2, 0. 71 moles

Q31.Element " E" belongs to the period 4 and group 16 of the periodic table. The valence shell electron configuration of the element, which is just above " E" in the group is (1) 2s22p4 (2) 3d10, 4s2, 4p4 (3) 3s23p4 (4) 4d10, 5s2, 5p4

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.Which of the following is the correct plot for the probability density ψ2(r) as a function of distance ′r′ of the electron form the nucleus for 2s orbital? JEE Main 2022 (29 Jun Shift 2) JEE Main Previous Year Paper (1) (2) (3) (4)

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.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.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.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.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