Practice Questions

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.The linear combination of atomic orbitals to form molecular orbitals takes place only when the combining atomic orbitals A. have the same energy B. have the minimum overlap C. have same symmetry about the molecular axis D. have different symmetry about the molecular axis Choose the most appropriate from the options given below: (1) A, B, C only (2) A and C only (3) B, C, D only (4) B and D only

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.Given below are two statements : Statement I : The metallic radius of Na is 1.86 A∘ and the ionic radius of Na+ is lesser than 1.86 A∘ . Statement II : Ions are always smaller in size than the corresponding elements. 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) Statement I is incorrect but Statement II is true (3) Both Statement I and Statement II are true (4) Statement I is correct but Statement II is false

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

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)

Q32.The correct order of first ionization enthalpy values of the following elements is : (A) O (B) N (C) Be (D) F (E) B Choose the correct answer from the options given below : (1) E < C < A < B < D (2) C < E < A < B < D (3) B < D < C < E < A (4) A < B < D < C < E

Q32.The electronic configuration of Einsteinium is : (Given atomic number of Einsteinium = 99) (1) [Rn]5f 106 d∘7 s2 (2) [Rn]5f 136 d∘7 s2 (3) [Rn]5f 116 d∘7 s2 (4) [Rn]5f 126 d∘7 s2

Q32.Given below are two statements: Statement-I: Since fluorine is more electronegative than nitrogen, the net dipole moment of NF3 is greater than NH3. Statement-II: In NH3, the orbital dipole due to lone pair and the dipole moment of NH bonds are in opposite direction, but in NF3 the orbital dipole due to lone pair and dipole moments of N-F bonds are in same direction. In the light of the above statements. Choose the most appropriate from the options given below. (1) Statement I is true but Statement II is false. (2) Both Statement I and Statement II are false. (3) Both statement I and Statement II is are true. (4) Statement I is false but Statement II is are true.

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 element having the highest first ionization enthalpy is (1) Si (2) Al (3) N (4) C

Q32.Given below are two statements : one is labelled as Assertion A and the other is labelled as Reason R: Assertion A: The first ionisation enthalpy decreases across a period. Reason R: The increasing nuclear charge outweighs the shielding across the period. In the light of the above statements, choose the most appropriate from the options given below: (1) Both A and R are true and R is the correct (2) A is true but R is false explanation of A (3) A is false but R is true (4) Both A and R are true but R is NOT the correct explanation of A

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 electron affinity value are negative for A. Be →Be− B. N →N− C. O →O2− D. Na →Na− E. Al →Al− Choose the most appropriate answer from the options given below : (1) D and E only (2) A, B and C only (3) A and D only (4) A, B, D and E only

Q32.The correct order of the first ionization enthalpy is (1) Al > Ga > Tl (2) Ga > Al > B (3) Tl > Ga > Al (4) B > Al > Ga

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. List - I List - II (Elements) (Properties in their respective groups) A. Cl, S I. Elements with highest electronegativity B. Ge, As II. Elements with largest atomic size Match List I with List II Choose Elements which show properties of both C. Fr, Ra III. metals and non-metal Elements with highest negative electron D. F, O IV. gain enthalpy the correct answer from the options given below: (1) A-II, B-I, C-IV, D-III (2) A-III, B-II, C-I, D-IV (3) A-IV, B-III, C-II, D-I (4) A-II, B-III, C-IV, D-I

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

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