Practice Questions

Q45.Which of the following compounds is an example of Freon? (1) C2H2 F2 (2) C2 F4 (3) C2 HF3 (4) C2 Cl2 F2

Q45.The set which does not have ambidentate ligand(s) is (1) C2O42 - , ethylene diammine, H2O (2) EDTA 4 - , NCS-, C2O42 - (3) NO2- , C2O42 - , EDTA 4- (4) C2O42 - , NO2- , NCS-

Q45.The Total pressure observed by mixing two liquid A and B is 350 mm Hg when their mole fractions are 0. 7 and 0. 3 respectively. The Total pressure becomes 410 mm Hg if the mole fractions are changed to 0. 2 and 0. 8 respectively for A and B . The vapour pressure of pure A is ______ mm Hg . (Nearest integer) Consider the liquids and solutions behave ideally

Q45.The normal rain water is slightly acidic and its pH value is 5. 6 because of which one of the following ? (1) CO2 + H2O →H2 CO3 (2) N2O5 + H2O →2 HNO3 (3) 2 SO2 + O2 + 2H2O →2H2 SO4 (4) 4 NO2 + O2 + 2H2O →4 HNO3

Q45.The correct IUPAC nomenclature for the following compound is: (1) 2 -Methyl- 5 -oxohexanoic acid (2) 2 -Formyl- 5 -methylhexan- 6 -oic acid (3) 5 -Methyl- 2 -oxohexan- 6 -oic acid (4) 5 -Formyl- 2 -methylhexanoic acid

Q45.For the first order reaction A →B the half life is 30 min. The time taken for 75% completion of the reaction is mm. (Nearest integer) Given : log 2 = 0. 3010 log 3 = 0. 4771 log 5 = 0. 6989

Q45.The major product formed in the Friedel-Craft acylation of chlorobenzene is (1) (2) (3) (4) Q46. ‘ A’ formed in the above reaction is (1) (2) (3) (4)

Q45.The equilibrium constant for the reaction Zn(s) + Sn2+(aq) ⇌Zn2+(aq) + Sn(s) is 1 × 1020 at 298 K . The magnitude of standard electrode potential of Sn / Sn2+ if E0 = −0. 76 V is _____ ×10−2 V . (Nearest Zn2* / Zn integer) Given : 2.303 RT = 0. 059 V F

Q45.Assertion A: Hydrolysis of an alkyl chloride is a slow reaction but in the presence of NaI, the rate of hydrolysis increases. Reason R: I- is a good nucleophile as well as a good leaving group. In the light of the above statements, choose the correct answer from the options given below. (1) A is false but R is true (2) A is true but R is false (3) Both A and R are true and R is the correct (4) Both A and R are true and R is not the correct explanation of A explanation of A

Q45.Identify the incorrect option from the following: JEE Main 2023 (01 Feb Shift 1) JEE Main Previous Year Paper (1) (2) (3) (4)

Q45. Pt (s)H2( g)(1 bar)|H+(aq)(1M)| M3+(aq), M+(aq) Pt(s) The Ecell for the given cell is 0. 1115 V at 298 K [M+(aq)] When = 10a [M3+(aq)] The value of a is ___________ Given : Eθ M3+/M+= 0. 2 V 2.303 RT = 0. 059 V F

Q45.Number of crystal systems from the following where body centred unit cell can be found, is _____. Cubic, tetragonal, orthorhombic, hexagonal, rhombohedral, monoclinic, triclinic

Q45.The radical which mainly causes ozone depletion in the presence of UV radiations is : (1) Cl⋅ (2) NO⋅ ⋅ ⋅ (3) OH (4) CH 3

Q45.For the reaction Acetone RCH2Br + I- ⟶ RCH2I + Br- major The correct statement is (1) Br– can act as competing nucleophile. (2) The reaction can occur in acetic acid also. (3) The transition state formed in the above reaction (4) The solvent used in the reaction solvates the ions is less polar than the localised anion. formed in rate determining step

Q45. (i) O3 −2 −hexene → Products (ii) H2O The two products formed in above reaction are (1) Butanal and acetaldehyde (2) Butanoic acid and acetaldehyde (3) Butanal and acetic acid (4) Butanoic acid and acetic acid

Q45.Iron oxide FeO, crystallises in a cubic lattice with a unit cell edge length of 5. 0Å . If density of the FeO in the crystal is 4. 0 g cm−3 , then the number of FeO units present per unit cell is _____ (Nearest integer) Given : Molar mass of Fe and O is 56 and 16 g mol−1 respectively. NA = 6. 0 × 1023 mol−1

Q45.The correct order of the number of unpaired electrons in the given complexes is (A) [Fe ( CN ) 3 - 6] (B) FeF6 3 - (C) CoF6 3 - (D) Cr ( oxalate 3 - ) 3 (E) Ni ( CO ) 4 Choose the correct answer from the options given below: (1) E < A < D < C < B (2) E < A < B < D < C (3) A < E, C < B < D (4) A < E < D < C < B

Q46.What weight of glucose must be dissolved in 100 g of water to lower the vapour pressure by 0. 20 mm Hg ? (Assume dilute solution is being formed) Given: Vapour pressure of pure water is 54. 2 mm Hg at room temperature.Molar mass of glucose is 180 g mol−1 (1) 3. 59 g (2) 3. 69 g (3) 4. 69 g (4) 2. 59 g

Q46.Which of the following complex has a possibility to exist as meridional isomer? (1) [Co ( NH3 ) ( NO2 ) (2) [Pt ( NH3 ) 3 3] 2Cl2] (3) [Co ( en (4) [Co ( en ) ) 2Cl2] 3]

Q46.A first order reaction has the rate constant, k = 4. 6 × 10−3 s−1 . The number of correct statement/s from the following is/are Given: log 3 = 0. 48 . A. Reaction completes in 1000 s. B. The reaction has a half-life of 500 s. C. The time required for 10% completion is 25 times the time required for 90% completion. D. The degree of dissociation is equal to (1 −e−kt). E. The rate and the rate constant have the same unit.

Q46.Match List I with List II List I List II A Nitrogen oxides in air I Eutrophication B Methane in air II pH of rain water becomes 5. 6 C Carbon dioxide III Global warming D Phosphate fertilisers in water IV Acid rain Choose the correct answer from the options given below : (1) A-II, B-III, C-I, D-IV (2) A-I, B-II, C-III, D-IV (3) A-IV, B-III, C-II, D-I (4) A-IV, B-II, C-III, D-I JEE Main 2023 (12 Apr Shift 1) JEE Main Previous Year Paper Q47. 80 mole percent of MgCl2 is dissociated in aqueous solution. The vapour pressure of 1. 0 molal aqueous solution of MgCl2 at 38oC is _____ mm Hg. (Nearest integer) Given: Vapour pressure of water at 38oC is 50 mm Hg

Q46.The major product ‘P’ formed in the given reaction is JEE Main 2023 (10 Apr Shift 2) JEE Main Previous Year Paper (1) (2) (3) (4)

Q46.Solid Lead nitrate is dissolved in 1 litre of water. The solution was found to boil at 100. 15°C. When 0. 2 mol of NaCl is added to the resulting solution, it was observed that the solution froze at −0. 8°C. The solutbility product of PbCl2 formed is _____ ×10−6 at 298 K. (Nearest integer) Given : Kb = 0. 5K kg mol−1 and Kf = 1. 8 kg mol−1 . Assume molality to be equal to molarity in all cases. JEE Main 2023 (29 Jan Shift 1) JEE Main Previous Year Paper

Q46.Identify the correct order of reactivity for the following pairs towards the respective mechanism (A) (B) (C) Electrophilic substitution (D) Nucleophilic substitution Choose the correction answer from the options given below: (1) B, C and D only (2) A, B, C and D (3) A, B and D only (4) A, C and Donly

Q46.The total number of stereoisomers for the complex [Cr ( ox ) 2ClBr] 3 – (where ox = oxalate) is (1) 3 (2) 2 (3) 4 (4) 1