Practice Questions

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.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 +

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

Q33.Which of the following relation is not correct? JEE Main 2022 (28 Jul Shift 1) JEE Main Previous Year Paper (1) ΔH = ΔU - PΔV (2) ΔU = q + W (3) ΔSsys + ΔSsurr ≥0 (4) ΔG = ΔH - TΔS

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. 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

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 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

Q34.Which of the following can be used to prevent the decomposition of H2O2 ? (1) Urea (2) Formaldehyde (3) Formic acid (4) Ethanol

Q34.Addition of H2 SO4 to BaO2 produces (1) BaO, SO2 and H2O (2) BaHSO4 and O2 (3) BaSO4, H2 and O2 (4) BaSO4 and H2O2

Q34.The highest industrial consumption of molecular hydrogen is to produce compound of element : (1) Carbon (2) Oxygen (3) Chlorine (4) Nitrogen

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.Which amongst the given plots is the correct plot for pressure (p) vs density (d) for an ideal gas? (1) (2) (3) (4)

Q35.Number of lone pair (s) of electrons on central atom and the shape of BrF3 molecule respectively, are : (1) 0 , triangular planar. (2) 1 , pyramidal. (3) 2 , bent T-shape. (4) 1, bent T-shape Q36. 4. 0 moles of argon and 5. 0 moles of PCl5 are introduced into an evacuated flask of 100 litre capacity at 610 K. The system is allowed to equilibrate. At equilibrium, the total pressure of mixture was found to be 6. 0 atm. The Kp for the reaction is [Given : R = 0. 082 L atm K−1 mol−1 ] JEE Main 2022 (29 Jun Shift 2) JEE Main Previous Year Paper (1) 2. 25 (2) 6. 24 (3) 12. 13 (4) 15. 24

Q35.The reaction of zinc with excess of aqueous alkali, evolves hydrogen gas and gives (1) Zn (OH)2 (2) ZnO (3) [Zn (OH)4]2− (4) [ZnO2]2−

Q35.Boiling of hard water is helpful in removing the temporary hardness by converting calcium hydrogen carbonate and magnesium hydrogen carbonate to (1) CaCO3 and Mg (OH)2 (2) CaCO3 and MgCO3 (3) Ca (OH)2 and MgCO3 (4) Ca (OH)2 and Mg (OH)2

Q35.Which amongst the following is not a pesticide? JEE Main 2022 (28 Jun Shift 1) JEE Main Previous Year Paper (1) DDT (2) Dieldrin (3) Organophosphate (4) Sodium Arsenite

Q36.Given below are two statements. Statement I : Stannane is an example of a molecular hydride. Statement II : Stannane is a planar molecule. In the light of the above statement, choose the most appropriate answer from the options given below (1) Both Statement I and Statement II are true. (2) Both Statement I and Statement II are false. (3) Statement I is true but Statement II is false. (4) Statement I is false but Statement II is true.