Practice Questions

Q32.Given below are two statements : Statement (I) : The oxidation state of an element in a particular compound is the charge acquired by its atom on the basis of electron gain enthalpy consideration from other atoms in the molecule. Statement (II) : pπ −pπ bond formation is more prevalent in second period elements over other periods. In the light of the above statements, choose the most appropriate answer from the 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 incorrect but Statement II is (4) Statement I is correct but Statement II is correct incorrect

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 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.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.Given below are two statements : Statement (I) : Both metal and non-metal exist in $\mathrm{p}$ and d-block elements. Statement (II) : Non-metals have higher ionisation enthalpy and higher electronegativity than the metals. In the light of the above statements, choose the most appropriate answer from the option given below: (1) Both Statement I and Statement II are false (2) Statement I is false but Statement II is true (3) Statement I is true but Statement II is false (4) Both Statement I and Statement II are true

Q32.Given below are the two statements: one is labeled as Assertion (A) and the other is labeled as Reason (R). JEE Main 2024 (30 Jan Shift 1) JEE Main Previous Year Paper Assertion (A): There is a considerable increase in covalent radius from N to P . However from As to Bi only a small increase in covalent radius is observed. Reason (R): covalent and ionic radii in a particular oxidation state increases down the group. In the light of the above statement, choose the most appropriate answer from the options given below: (1) (A) is false but (R) is true (2) Both (A) and (R) are true but (R) is not the correct explanation of (A) (3) (A) is true but (R) is false (4) Both (A) and (R) are true and (R) is the correct explanation of (A)

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. List - I List - II (A) ICl (I) T - shape Match List I with List II (B) ICl3 (II) pyramidal Choose the correct answer from the (C) ClF5 (III) Pentagonal bipyramidal (D) IF7 (IV) Linear options given below : (1) (A)-(IV), (B)-(I), (C)-(II), (D)-(III) (2) (A)-(I), (B)-(IV), (C)-(III), (D)-(II) (3) (A)-(IV), (B)-(III), (C)-(II), (D)-(I) (4) (A)-(I), (B)-(III), (C)-(II), (D)-(IV)

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.Given below are two statements : Statement (I) : A π bonding MO has lower electron density above and below the inter-nuclear axis. Statement (II) : The π* antibonding MO has a node between the nuclei. In light of the above statements, choose the most appropriate 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 false but Statement II is true (4) Statement I is true but Statement II is false

Q33.Given below are two statements : Statement I : In group 13, the stability of +1 oxidation state increases down the group. Statement II : The atomic size of gallium is greater than that of aluminium. In the light of the above statements, choose the most appropriate answer from the options given below : (1) Both Statement I and Statement II are correct (2) Statement I is incorrect but Statement II is correct (3) Both Statement I and Statement II are incorrect (4) Statement I is correct but Statement II is incorrect

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.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.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.Arrange the bonds in order of increasing ionic character in the molecules. LiF, K2O, N2, SO2 and ClF3 . (1) ClF3 < N2 < SO2 < K2O < LiF (2) LiF < K2O < ClF3 < SO2 < N2 (3) N2 < SO2 < ClF3 < K2O < LiF (4) N2 < ClF3 < SO2 < K2O < LiF

Q33.Which one of the following molecules has maximum dipole moment? (1) NF3 (2) CH4 (3) PF5 (4) NH3

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.Given below are two statements: Statement I: Fluorine has most negative electron gain enthalpy in its group. Statement II: Oxygen has least negative electron gain enthalpy in its group. In the light of the above statements, choose the most appropriate from the options given below. (1) Both Statement I and Statement II are true (2) Statement I is true but Statement II is false (3) Both Statement I and Statement II are false (4) Statement I is false but Statement II is true JEE Main 2024 (29 Jan Shift 2) JEE Main Previous Year Paper

Q33.Choose the polar molecule from the following : (1) CCl4 (2) CO2 (3) CH2 = CH2 (4) CHCl3

Q33.Given below are two statements : Statement I : The correct order of first ionization enthalpy values of Li, Na, F and Cl is Na < Li < Cl < F. Statement II : The correct order of negative electron gain enthalpy values of Li, Na, F and Cl is Na < Li < F < Cl In the light of the above statements, choose the correct answer from the options given below : (1) Statement I is true but Statement II is false (2) Statement I is false but Statement II is true (3) Both Statement I and Statement II are false (4) Both Statement I and Statement II are true

Q33.Given below are two statements: One is labelled as Assertion A and the other is labelled as Reason R. Assertion A : H2Te is more acidic than H2 S. Reason R: Bond dissociation enthalpy of H2Te is lower than H2 S. In the light of the above statements. Choose the most appropriate from the options given below. JEE Main 2024 (30 Jan Shift 2) JEE Main Previous Year Paper (1) Both A and R are true but R is NOT the correct (2) Both A and R are true and R is the correct explanation of A. explanation of A. (3) A is false but R is true. (4) A is true but R is false.

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.Consider the following elements. Which of the following is/are true about A', B', C' and D' ? A. Order of atomic radii: B' < A' < D' < C' B. Order of metallic character : B' < A' < D' < C' C. Size of the element : D' < C' < B' < A' D. Order of ionic radii : B'+ < A'+ < D'+ < C'+ Choose the correct answer from the options given below: (1) A only (2) A, B and D only (3) A and B only (4) B, C and D only

Q33.Match List - I with List-II List I (Molecule) List II (Shape) A. BrF5 i. T-shape B. H2O ii. See saw C. ClF3 iii. Bent D. SF4 iv. Square pyramidal (1) (A)-I, (B)-II, (C)-IV, (D)-III (2) (A) -II, (B)-I, (C)-III, (D)-IV (3) (A)-III, (B)-IV, (C)-I, (D)-II (4) (A)-IV, (B)-III, (C)-I, (D)-II

Q33.Match List - I with List - II. List - I List - II Reaction Type of redox reaction (A) N2( g) + O2( g) →2NO(g) (I) Decomposition Choose the (B) 2 Pb(NO3)2( s) →2PbO(s) + 4NO2( g) + O2( g) (II) Displacement (C) 2Na(s) + 2H2O(I) →2NaOH(aq. + H2( g) (III) Disproportionation (D) 2NO2( g ) + 2−OH(aq. ) →NO−2( aq. ) + NO−3( aq. ) + H2O(l) (IV) Combination correct answer from the options given below : (1) (A)-(II), (B)-(III), (C)-(IV), (D)-(I) (2) (A)-(III), (B)-(II), (C)-(I), (D)-(IV) (3) (A)-(IV), (B)-(I), (C)-(II), (D)-(III) (4) (A)-(I), (B)-(II), (C)-(III), (D)-(IV)