Practice Questions

Q28.The shape/structure of [XeF5]− and XeO3 F2 , respectively are : (1) pentagonal planar and trigonal bipyramidal (2) octahedral and square pyramidal (3) trigonal bipyramidal and pentagonal planar (4) trigonal bipyramidal and trigonal bipyramidal

Q28.Arrange the following bonds according to their average bond energies in descending order: C −Cl, C −Br, C −F, C −I (1) C −F > C −Cl > C −Br > C −I (2) C −Br > C −I > C −Cl > C −F (3) C −I > C −Br > C −Cl > C −F (4) C −Cl > C −Br > C −I > C −F

Q28.The third ionization enthalpy is minimum for: (1) Co (2) Fe (3) Ni (4) Mn

Q28.If AB4 molecule is a polar molecule, a possible geometry of AB4 is : (1) Square pyramidal (2) Tetrahedral (3) Rectangular planar (4) Square planar

Q28.The five successive ionization enthalpies of an element are 800, 2427, 3658, 35024 32824 kJ mol–1 . The number of valence electrons in the element is: (1) 5 (2) 4 (3) 3 (4) 2

Q28.The reaction in which the hybridisation of the underlined atom is affected is (1) Disproportionation (2) 420 K−−H3PO2 → H2SO4 + NaCl → ¯¯ (3) H+ (4) XeF4 + SbF5 → NH3 →¯¯

Q28.The electron gain enthalpy (in kJ ) of fluorine, chlorine, bromine and iodine, respectively, are mol (1) −296, −325, −333 and −349 (2) −349, −333, −325 and −296 (3) −333, −349, −325 and −296 (4) −333, −325, −349 and −296

Q28.The increasing order of boiling points of the following compounds is : (1) I < III < IV < II (2) I < IV < II< III (3) IV < I < II < III (4) III < I < II < IV JEE Main 2020 (05 Sep Shift 2) JEE Main Previous Year Paper

Q28.Of the species, NO, NO+, NO2+ and NO−, the one with minimum bond strength is : (1) NO+ (2) NO (3) NO2+ (4) NO−

Q29.Consider the following molecules and statements related to them: (a) (B) is more likely to be crystaline than (A) (b) (B) has higher boiling point than (A) (c) (B) dissolves more readily than (A) in water Identify the correct option from below: (1) (a) and (b) are true (2) (a) and (c) are true (3) only (a) is true (4) (b) and (c) are true

Q29.The intermolecular potential energy for the molecules A , B , C and D given below suggests that: (1) A −D has the shortest bond length (2) A −A has the largest bond enthalpy (3) D is more electronegative than other atoms. (4) A −B has the stiffest bond.

Q29.Arrange the following solutions in the decreasing order of pOH : (A) 0. 01 MHCl (B) 0. 01 MNaOH (C) 0. 01 MCH3 COONa (D) 0. 01 MNaCl (1) (A) > (C) > (D) > (B) (2) (A) > (D) > (C) > (B) (3) (B) > (C) > (D) > (A) (4) (B) > (D) > (C) > (A)

Q29.Match the type of interaction in column A with the distance dependence of their interaction energy in column B : A B (i) ion - ion (a) 1 r (ii) Dipole - dipole (b) 1 r2 (iii) London dispersion (c) 1 r3 (iv) 1 r6 JEE Main 2020 (02 Sep Shift 2) JEE Main Previous Year Paper (1) (i) – (b); (ii) – (d); (iii) – (c) (2) (i) – (a); (ii) – (b); (iii) – (d) (3) (i) – (a); (ii) – (b); (iii) – (c) (4) (i) – (a); (ii) – (c); (iii) – (d)

Q29.Dihydrogen of high purity (> 99. 95 %) is obtained through : (1) The reaction of Zn with dilute HCl. (2) The electrolysis of acidified water using Pt electrodes. (3) The electrolysis of brine solution. (4) The electrolysis of warm Ba (OH)2 solution using Ni electrrodes.

Q29.The compound that has the largest H–M–H bond angle (M = N, O, S, C), is : (1) H2O (2) NH3 (3) H2S (4) CH4

Q29.If the magnetic moment of a di-oxygen species is 1.73 B. M., it may be (1) O−2 or O+2 . (2) O2 or O+2 . (3) O2 or O−2 . (4) O2, O−2 or O+2 .

Q29.Consider the following reaction: N2O4(g) = 2 NO2(g) : ΔH0 = +58k For each of the following cases (a, b), the direction in which the equilibrium shifts is: (a) Temperature is decreased. (b) Pressure is increased by adding N2 at constant T. (1) (a) towards product, (b) towards reactant (2) (a) towards reactant, (b) towards product (3) (a) towards reactant, (b) no change (4) (a) towards product, (b) no change

Q29.The dipole moments of CCl4, CHCl3 and CH4 are in the order (1) CHCl3 < CH4 = CCl4 (2) CCl4 < CH4 < CHCl3 (3) CH4 < CCl4 < CHCl3 (4) CH4 = CCl4 < CHCl3

Q29.The molecule in which hybrid MOs involve only one d-robital of the central atom is : (1) Ni(CN)4]2− (2) BrF5 (3) XeF4 (4) [CrF6]3−

Q29.Which one of the following graphs is not correct for ideal gas? d = Density, P = Pressure, T =Temperature JEE Main 2020 (02 Sep Shift 1) JEE Main Previous Year Paper (1) I (2) II (3) IV (4) III

Q29.An acidic buffer is obtained on mixing: (1) 100 mL of 0 .1 MCH3 COOH and 100 mL of 0 .1 MNaOH (2) 100 mL of 0 .1 MHCl and 200 mL of 0 .1 MNaCl (3) 100 mL of 0 .1 MCH3COOH and 200 mL of 0 .1 MNaOH (4) 100 mL of 0 .1 MHCl and 200 mL of 0 .1 MCH3 COONa

Q30.For the following Assertion and Reason, the correct option is: Assertion: The pH of water increases with increase in temperature. Reason: The dissociation of water into H+ and OH− is an exothermic reaction. (1) Both assertion and reason are true, and the reason (2) Both assertion and reason are false. is the correct explanation for the assertion. (3) Both assertion and reason are true, but the reason (4) Assertion is not true, but reason is true. is not the correct explanation for the assertion.

Q30.For one mole of an ideal gas, which of these statements must be true? (a) Internal energy (U) and enthalpy (H) each depends on temperature. (b) Compressibility factor Z is not equal to 1 (c) CP, m –CV, m = R (d) dU = Cv dT for any process (1) (a) and (c) (2) (b), (c) and (d) (3) (c) and (d) (4) (a), (c) and (d)

Q30.For the following Assertion and Reason, the correct option is Assertion (A) : When Cu (II) and sulphide ions are mixed, they react together extremely quickly to give a solid. Reason (R) : The equilibrium constant of Cu2+(aq) + S2−(aq) ⇌Cus(s) is high because the solubility product is low. (1) (A) is false and (R) is true. (2) Both (A) and (R) are false. (3) Both (A) and (R) are true but (R) is not the (4) Both (A) and (R) are true and (R) is the explanation for (A). explanation for (A).

Q30.Which one of the following compounds possesses the most acidic hydrogen? (1) (2) H3C −C ≡C −H (3) (4)