Practice Questions

Q31.Compare the energies of following sets of quantum numbers for multielectron system. (A) n = 4, 1 = 1 (B) n = 4, l = 2 (C) n = 3, 1 = 1 (D) n = 3, 1 = 2 (E) n = 4, 1 = 0 Choose the correct answer from the options given below : (1) (B) > (A) > (C) > (E) > (D) (2) (E) < ( C ) < (D) < ( A ) < ( B ) (3) (E) > ( C ) > ( A ) > ( D ) > (B) (4) (C) < (E) < (D) < (A) < (B)

Q31.Choose the Incorrect Statement about Dalton's Atomic Theory (1) chemical reactions involve reorganization of (2) Matter consists of indivisible atoms. atoms (3) Compounds are formed when atoms of different (4) Compounds are formed when atoms of different elements combine in any ratio. elements combine in any ratio. All the atoms of a given element have identical properties including identical mass.

Q32.In case of isoelectronic species the size of F–, Ne and Na+ is affected by: (1) Principal quantum number n (2) None of the factors because their size is the same (3) Electron-electron interaction in the outer orbitals (4) Nuclear charge z

Q32.Which of the following electronic configuration would be associated with the highest magnetic moment ? (1) [Ar] 3d7 (2) [Ar] 3d8 (3) [Ar] 3d3 (4) [Ar] 3d6

Q32.The four quantum numbers for the electron in the outer most orbital of potassium (atomic no. 19) are (1) n = 4, l = 2, m = −1, s = + 1 (2) n = 4, l = 0, m = 0, s = + 1 2 2 1 1 (3) n = 3, l = 0, m = −1, s = + (4) n = 2, l = 0, m = 0, s = + 2 2

Q32.The ratio KP for the reaction : CO(g) + 12 O2( g) ⇌CO2( g) is : KC (1) 1 (2) (RT)1/2 √RT (3) RT (4) 1

Q32.The incorrect postulates of the Dalton's atomic theory are : (A) Atoms of different elements differ in mass. (B) Matter consists of divisible atoms. (C) Compounds are formed when atoms of different element combine in a fixed ratio. (D) All the atoms of given element have different properties including mass. (E) Chemical reactions involve reorganisation of atoms. Choose the correct answer from the options given below : (1) (C), (D), (E) only (2) (B), (D) only (3) (A), (B), (D) only (4) (B), (D), (E) only

Q32.The shape of carbocation is : (1) diagonal pyramidal (2) trigonal planar (3) tetrahedral (4) diagonal

Q32.The molecular formula of second homologue in the homologous series of mono carboxylic acids is _________. (1) C3H6O2 (2) C2H4O2 (3) CH2O (4) C2H2O2

Q33. List - I (Element) List - II (Electronic configuration) A. N I. [Ar]3 d104 s24p5AR Match List I with List II B. S II. [Ne]3 s23p4 Choose C. Br III. [He]2 s22p3 D. Kr IV. [Ar]3 d104 s24p6 the correct answer from the options given below: (1) A-III, B-II, C-I, D-IV (2) A-II, B-I, C-IV, D-III (3) A-I, B-IV, C-III, D-II (4) A-IV, B-III, C-II, D-I JEE Main 2024 (09 Apr Shift 2) JEE Main Previous Year Paper

Q33.Which of the following is not correct? (1) ΔG is negative for a spontaneous reaction (2) ΔG is positive for a spontaneous reaction (3) ΔG is zero for a reversible reaction (4) ΔG is positive for a non-spontaneous reaction

Q33.In which one of the following pairs the central atoms exhibit sp2 hybridization ? (1) H2O and NO2 (2) BF3 and NO−2 (3) NH−2 and H2O (4) NH−2 and BF3 JEE Main 2024 (09 Apr Shift 1) JEE Main Previous Year Paper

Q33. List-I List-II (Molecule) (Shape) A. NH3 I. Square pyramid Match List I with List II Choose the correct answer B. BrF5 II. Tetrahedral C. PCl5 III. Trigonal pyramidal D. CH4 IV. Trigonal bipyramidal from the options given below: (1) A-II, B-IV, C-I, D-III (2) A-III, B-I, C-IV, D-II (3) A-IV, B-III, C-I, D-II (4) A-III, B-IV, C-I, D-II JEE Main 2024 (08 Apr Shift 1) JEE Main Previous Year Paper

Q33.For the given reaction, choose the correct expression of KC from the following: Fe3 + aq + SCN- aq ⇌(FeSCN ) 2 + aq (1) 𝐹𝑒𝑆𝐶𝑁2 + (2) 𝐹𝑒3 + 𝑆𝐶𝑁- 𝐾𝐶= + 𝐾𝐶= + 𝐹𝑒3 𝑆𝐶𝑁- 𝐹𝑒𝑆𝐶𝑁2 (3) 𝐹𝑒𝑆𝐶𝑁2 + (4) 𝐹𝑒𝑆𝐶𝑁2 2 𝐾𝐶= + + 𝐾𝐶= + 𝐹𝑒3 2𝑆𝐶𝑁-2 𝐹𝑒3 𝑆𝐶𝑁-

Q33.When ψA and ψB are the wave functions of atomic orbitals, then σ∗ is represented by : (1) ψA + 2ψB (2) ψA −ψB (3) ψA + ψB (4) ψA −2ψB

Q33.Which of the following material is not a semiconductor. (1) Silicon (2) Copper oxide (3) Germanium (4) Graphite JEE Main 2024 (06 Apr Shift 1) JEE Main Previous Year Paper

Q33.Bond line formula of HOCH ( CN ) is: 2 (1) (2) (3) (4)

Q34. List - I List - II (Hybridization) (Orientation in Space) A. sp3 I. Trigonal bipyramidal Match List I with List II Choose the correct B. dsp2 II. Octahedral C. sp3 d III. Tetrahedral D. sp3 d2 IV. Square planar answer from the options given below: (1) A-IV, B-III, C-I, D-II (2) A-III, B-IV, C-I, D-II (3) A-III, B-I, C-IV, D-II (4) A-II, B-I, C-IV, D-III

Q34.IUPAC name of following compound is (1) 2 – Aminopentanenitrile (2) 2 – Aminobutanenitrile (3) 3 – Aminobutanenitrile (4) 3 – Aminopropanenitrile

Q34. According to IUPAC system, the compound is named as: (1) Cyclohex −1 −en −2 −ol (2) 1 −Hydroxyhex −2 −ene (3) Cyclohex −1 −en −3 −ol (4) Cyclohex −2 −en −1 −ol

Q34.Structure of 4 −Methylpent −2 −enal is: (1) (2) (3) (4)

Q34.Which of the following is least ionic? (1) BaCl2 (2) AgCl (3) KCl (4) CoCl2 𝐶 Q35.𝐴𝑔⇌𝐵𝑔+ 1 2𝑔.1 The correct relationship between 𝐾𝑃, 𝛼 and equilibrium3 1 pressure 𝑃 is 2 (1) α 2P (2) α 2P KP = 1 KP = 1 2 2 +1 α32 2 +1 α121 −α (3) α 2P 2 (4) α 2P 2 KP = 3 KP = 3 2 + α 2 2 + α 2

Q35.A species having carbon with sextet of electrons and can act as electrophile is called (1) carbon free radical (2) carbanion (3) carbocation (4) pentavalent carbon Q36.‘Adsorption’ principle is used for which of the following purification method? (1) Extraction (2) Chromatography (3) Distillation (4) Sublimation

Q35. Match List I with List II : Choose the correct answer from the options given below : (1) (A) - (IV), (B) - (III), (C) - (I), (D) - (II) (2) (A) - (I), (B) - (II), (C) - (IV), (D) - (III) (3) (A) - (III), (B) - (I), (C) - (II), (D) - (IV) (4) (A) - (II), (B) - (IV), (C) - (III), (D) - (I)

Q35.Which among the following purification methods is based on the principle of “Solubility” in two different solvents? (1) Column Chromatography (2) Sublimation (3) Distillation (4) Differential Extraction