Practice Questions

Q34.The correct statement/s about Hydrogen bonding is/are A. Hydrogen bonding exists when H is covalently bonded to the highly electro negative atom. B. Intermolecular H bonding is present in o-nitro phenol C. Intramolecular H bonding is present in HF. D. The magnitude of H bonding depends on the physical state of JEE Main 2024 (04 Apr Shift 2) JEE Main Previous Year Paper the compound. E. H-bonding has powerful effect on the structure and properties of compounds Choose the correct answer from the options given below: (1) A, B, D only (2) A, D, E only (3) A only (4) A, B, C only

Q34.Identify the incorrect statements regarding primary standard of titrimetric analysis. (A) It should be purely available in dry form. (B) It should not undergo chemical change in air. (C) It should be hygroscopic and should react with another chemical instantaneously and stoichiometrically. (D) It should be readily soluble in water. (E) KMnO4 & NaOH can be used as primary standard. Choose the correct answer from the options given below : (1) (A) and (B) only (2) (C) and (E) only (3) (B) and (E) only (4) (C) and (D) only

Q34.The statement(s) that are correct about the species O2−, F−, Na+ and Mg2+ . (A) All are isoelectronic (B) All have the same nuclear charge (C) O2− has the largest ionic radii (D) Mg2+ has the smallest ionic radii Choose the most appropriate answer from the options given below : (1) (B), (C) and (D) only (2) (C) and (D) only (3) (A), (C) and (D) only (4) (A), (B), (C) and (D)

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.Chlorine undergoes disproportionation in alkaline medium as shown below : aCl2( g) + bOH−(aq) →cClO−(aq) + dCl−(aq) + eH2 O(l) The values of a, b, c and d in a balanced redox reaction are respectively : (1) 1, 2, 1 and 1 (2) 2, 2, 1 and 3 (3) 3, 4, 4 and 2 (4) 2, 4, 1 and 3

Q34.The equilibrium Cr2O2−7 ⇌2CrO2−4 is shifted to the right in : (1) an acidic medium (2) a basic medium (3) a neutral medium (4) a weakly acidic medium

Q34.Number of molecules/ions from the following in which the central atom is involved in sp3 hybridization is NO−3 , BCl3, ClO−2 , ClO3 (1) 4 (2) 3 (3) 2 (4) 1

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. List - I List - II A. Melting Point [K] I. T1 > In > Ga > A1 > B Match List I with List II B. Ionic Radius [M+3/pm] II. B > T1 > A1 ≈Ga > In Choose the C. ΔiH1 [ kJ mol−1] III. T1 > In > A1 > Ga > B D. Atomic Radius [pm] IV. B > A1 > T1 > In > Ga correct answer from the options given below: (1) A-II, B-III, C-IV, D-I (2) A-IV, B-I, C-II, D-III (3) A-I, B-II, C-III, D-IV (4) A-III, B-IV, C-I, D-II

Q34.The order of relative stability of the contributing structure is: JEE Main 2024 (27 Jan Shift 2) JEE Main Previous Year Paper Choose the correct answer from the options given below: (1) I > II > III (2) II > I > III (3) I = II = III (4) III > II > I

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.Given below are two statements: Statement I: N(CH3)3 and P(CH3)3 can act as ligands to form transition metal complexes. Statement II: As N and P are from same group, the nature of bonding of N(CH3)3 and P(CH3)3 is always same with transition metals. 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) Both Statement I and Statement II are correct. (4) Both Statement I and Statement II are incorrect.

Q35.Choose the correct option for free expansion of an ideal gas under adiabatic condition from the following : (1) q = 0, ΔT ≠0, w = 0 (2) q = 0, ΔT < 0, w ≠0 (3) q ≠0, ΔT < 0, w = 0 (4) q = 0, ΔT = 0, w = 0

Q35.Given below are two statements : Statement I : On passing HCl(g) through a saturated solution of BaCl2 , at room temperature white turbidity appears. Statement II : When HCl gas is passed through a saturated solution of NaCl, sodium chloride is precipitated due to common ion effect. 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 correct but Statement II is incorrect (3) Both Statement I and Statement II are incorrect (4) Statement I is incorrect but Statement II is correct

Q35.Given below are two statements : Statement (I) : A Buffer solution is the mixture of a salt and an acid or a base mixed in any particular quantities. Statement (II) : Blood is naturally occurring buffer solution whose pH is maintained by H2CO3/HCO−3 Θ concentrations. 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) Both Statement I and Statement II are true (3) Statement I is false but Statement II is true (4) Both Statement I and Statement II are false

Q35.Example of vinylic halide is (1) (2) (3) (4)

Q35.The correct increasing order for bond angles among BF3, PF3 and ClF3 is : (1) BF3 < PF3 < ClF3 (2) ClF3 < PF3 < BF3 (3) PF3 < BF3 < ClF3 (4) BF3 = PF3 < ClF3

Q35.The number of species from the following that have pyramidal geometry around the central atom is _______. S2O2−3 , SO2−4 , SO2−3 , S2O2−7 (1) 4 (2) 3 (3) 2 (4) 1

Q35. List - I List - II (Compound/Species) (Shape/Geometry) A. SF4 I. Tetrahedral Match List I with List II Choose the correct B. BrF3 II. Pyramidal C. BrO−3 III. See saw D. NH+4 +KS IV. Bent T-Shape answer from the options given below: (1) A-II, B-III, C-I, D-IV (2) A-II, B-IV, C-III, D-I (3) A-III, B-IV, C-II, D-I (4) A-III, B-II, C-IV, D-I

Q35.Methods used for purification of organic compounds are based on : (1) nature of compound and presence of impurity. (2) neither on nature of compound nor on the impurity present. (3) nature of compound only. (4) presence of impurity only.

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

Q35.The ascending acidity order of the following H atoms is (1) C < D < B < A (2) A < B < C < D (3) A < B < D < C (4) D < C < B < A

Q35.Given below are two statements : One is labelled as Assertion (A) and the other is labelled as Reason (R) Assertion (A) : Enthalpy of neutralisation of strong monobasic acid with strong monoacidic base is always −57 kJ mol−1 . Reason (R) : Enthalpy of neutralisation is the amount of heat liberated when one mole of H+ ions furnished by acid combine with one mole of OH− ions furnished by base to form one mole of water. In the light of the above statements, choose the correct answer from the options given below. JEE Main 2024 (05 Apr Shift 1) JEE Main Previous Year Paper (1) (A) is true but (R) is false (2) Both (A) and (R) are true but (R) is not the correct explanation of (A) (3) Both (A) and (R) are true and (R) is the correct (4) (A) is false but (R) is true explanation of (A)

Q35. KMnO4 decomposes on heating at 513 K to form O2 along with (1) MnO2 & K2O2 (2) K2 MnO4 & Mn (3) Mn & KO2 (4) K2 MnO4 & MnO2

Q35.Solubility of calcium phosphate (molecular mass, M) in water is Wg per 100 mL at 25°C . Its solubility product at 25°C will be approximately. 3 5 (1) 107W (2) 107W M M 5 5 (3) 103W (4) 105W M M JEE Main 2024 (01 Feb Shift 2) JEE Main Previous Year Paper