Practice Questions

Q32.Which one of the following species doesn't have a magnetic moment of 1. 73 BM, (spin only value)? (1) O+2 (2) CuI (3) [Cu (NH3)4] Cl2 (4) O−2

Q32.The ionic radius of Na+ ions is 1. 02°A. The ionic radii (in °A ) of Mg2+ and Al3+, respectively, are (1) 1. 05 and 0. 99 (2) 0. 72 and 0. 54 (3) 0. 85 and 0. 99 (4) 0. 68 and 0. 72

Q32.Which pair of oxides is acidic in nature? (1) B2O3, CaO (2) N2O, BaO (3) CaO, SiO2 (4) B2O3, SiO2

Q32.Given below are two statements: Statement I : H2O2 can act as both oxidising and reducing agent in basic medium. Statement II : In the hydrogen economy, the energy is transmitted in the form of dihydrogen. In the light of the above statements, choose the correct answer from the options given below: (1) Both statement I and statement II are false (2) Both statement I and statement II are true (3) Statement I is true but statement II is false (4) Statement I is false but statement II is true

Q32.The set in which compounds have different nature is: (1) B(OH)3 and H3 PO3 (2) B(OH)3 and Al(OH)3 (3) NaOH and Ca(OH)2 (4) Be(OH)2 and Al(OH)3

Q32.In polythionic acid, H2 SxO6(x = 3 to 5) the oxidation state(s) of sulphur is/are: (1) +6 only (2) +5 only (3) 0 and +5 only (4) +3 and +5 only

Q32.Which of the following are isostructural pairs? A. SO42 - and CrO4 2 - B. SiCl4 and TiCl4 C. NH3 and NO3- D. BCl3 and BrCl3 JEE Main 2021 (24 Feb Shift 1) JEE Main Previous Year Paper (1) A and C only (2) B and C only (3) A and B only (4) C and D only

Q32.The characteristics of elements X, Y and Z with atomic numbers, respectively, 33, 53 and 83 are: (1) X and Y are metalloids and Z is a metal (2) X is a metalloid, Y is a non-metal and Z is a metal. (3) X, Y and Z are metals. (4) X and Z are non-metals and Y is a metalloid

Q32.The correct set from the following in which both pairs are in correct order of melting point is: (1) LiF > LiCl; NaCl > MgO (2) LiCl > LiF; MgO > NaCl (3) LiCl > LiF; NaCl > MgO (4) LiF > LiCl; MgO > NaCl

Q32.Match List-I with List-II List - I List - II (Elements) (Properties) (a) SF4 (i) sp3 d2 (b) IF5 (ii) d2 sp3 (c) NO+2 (iii) sp3 d (d) NH+4 (iv) sp3 (v) sp Choose the correct answer from the options given below: (1) (a)-(i), (b)-( ii), (c)-(v) and (d)-(iii) (2) (a)-(ii), (b)-(i), (c)-(iv) and (d)-(v) (3) (a)-(iii), (b)-(i), (c)-(v) and (d)-(iv) (4) (a)-(iv), (b)-(iii), (c)-(ii) and (d)-(v)

Q32.A central atom in a molecule has two lone pairs of electrons and forms three single bonds. The shape of this molecule is (1) see-saw (2) planar triangular (3) T-shaped (4) trigonal pyramidal

Q32.During which of the following processes, does entropy decrease ? (A) Freezing of water to ice at 0°C (B) Freezing of water to ice at −10°C (C) N2( g) + 3H2( g) →2 NH3( g) (D) Adsorption of CO(g) and lead surface (E) Dissolution of NaCl in water (1) (A), (B),(C) and (D) only (2) (B) and (C) only (3) (A) and (E) only (4) (A), (C) and (E) only

Q32.Match List- I with List- II. List- I List- II Electronic configuration of elements ΔiH in kJ mol−1 (a) 1s22s2 (p) 801 (b) 1s22s22p4 (q) 899 (c) 1s22s22p3 (r) 1314 (d) 1s22s22p1 (s) 1402 Choose the most appropriate answer from the options given below: (1) (a) →(q), (b) →(r), (c) →(s), (d) →(p) (2) (a) →(p), (b) →(r), (c) →(s), (d) →(q) (3) (a) →(p), (b) →(s), (c) →(r), (d) →(q) (4) (a) →(s), (b) →(p), (c) →(q), (d) →(r)

Q32.The CORRECT order of first ionisation enthalpy is: (1) Mg < S < Al < P (2) Mg < Al < S < P (3) Al < Mg < S < P (4) Mg < Al < P < S

Q32.Given below are two statements: Statement I : In the titration between strong acid and weak base methyl orange is suitable as an indicator. Statement II : For titration of acetic acid with NaOH phenolphthalein is not a suitable indicator. In the light of the above statements, choose the most appropriate answer from the options given below: (1) Statement I is false but Statement II is true (2) Both Statement I and Statement II are true (3) Both Statement I and Statement II are false (4) Statement I is true but Statement II is false

Q32.The interaction energy of London forces between two particles is proportional to rx , where r is the distance between the particles. The value of x is : (1) 6 (2) −6 (3) 3 (4) −3

Q32.The plots of radial distribution functions for various orbitals of hydrogen atom against ' r′ are given below. The correct plot for 3s orbital is : (1) (2) (3) (4)

Q32.The first ionization energy of magnesium is smaller, as compared to that of elements X and Y , but higher than that of Z. The elements X, Y and Z , respectively, are : (1) chlorine, lithium and sodium (2) argon, lithium and sodium (3) argon, chlorine and sodium (4) neon, sodium and chlorine

Q33.Given below are two statements: One is labelled as Assertion A and the other labelled as Reason R. Assertion A : Lithium halides are some what covalent in nature. Reason R : Lithium possess high polarisation capability. In the light of the above statements, choose the most appropriate answer from the options given below: (1) A is true but R is false (2) A is false but R is true (3) Both A and R are true but R is NOT the correct (4) Both A and R are true and R is the correct explanation of A explanation of A

Q33.Monomer of Novolac is : (1) 3-Hydroxybutanoic acid. (2) 1, 3 -Butadiene and styrene. (3) phenol and melamine. (4) o-Hydroxymethylphenol.

Q33.Which one of the following statements is incorrect ? (1) Atomic hydrogen is produced when H2 (2) At around 2000 K, the dissociation of molecules at a high temperature are irradiated dihydrogen into its atoms is nearly 8 . 1% with UV radiation. (3) Bond dissociation enthalpy of H2 is highest (4) Dihydrogen is produced on reacting zinc with among diatomic gaseous molecules which HCl as well as NaOH . ( aq ) . contain a single bond.

Q33.The potassium ferrocyanide solution gives a Prussian blue colour, when added to : (1) CoCl3 (2) CoCl2 (3) FeCl2 (4) FeCl3

Q33.The oxide that gives H2O2 most readily on treatment with H2O is : (1) Na2 O2 (2) BaO2. 8H2O (3) SnO2 (4) PbO2 JEE Main 2021 (27 Aug Shift 2) JEE Main Previous Year Paper

Q33.Given below are two statements: Statement I : None of the alkaline earth metal hydroxides dissolve in alkali. Srtatement II : Solubility of alkaline earth metal hydroxides in water increases down the group. In the light of the above statements, choose the most appropriate answer from the options given below: (1) Statement I is correct but Statement II is (2) Statement I is incorrect but Statement II is incorrect. correct. (3) Statement I and Statement II both are incorrect. (4) Statement I and Statement II both are correct.

Q33.In the following the correct bond order sequence is: (1) O2−2 > O+2 > O−2 > O2 (2) O+2 > O−2 > O2−2 > O2 (3) O+2 > O2 > O−2 > O2−2 (4) O2 > O−2 > O2−2 > O+2