Practice Questions

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

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.A metal M crystallizes into two lattices :- face centred cubic (fcc) and body centred cubic (bcc) with unit cell edge length of 2. 0 and 2. 5 °A respectively. The ratio of densities of lattices fcc to bec for the metal M is _______(Nearest integer) Q46. 20% of acetic acid is dissociated when its 5 g is added to 500 mL of water. The depression in freezing point of such water is _____ × 10−3∘C. Atomic mass of C, H and O are 12, 1 and 16 a.m.u. respectively. [Given : Molal depression constant and density of water are 1. 86 K kg mol−1 and 1 g cm−3 respectively. Q47. 1 × 10−5 M AgNO3 is added to 1 L of saturated solution of AgBr. The conductivity of this solution at 298 K is _______ × 10−8 S m−1 . [Given : Ksp(AgBr) = 4. 9 × 10−13 at 298 K λ0 = 6 × 10−3 Sm2 mol−1 Ag+ JEE Main 2023 (01 Feb Shift 2) JEE Main Previous Year Paper λ0Br−= 8 × 10−3 Sm2 mol−1 λ0 = 7 × 10−3 Sm2 mol−1] NO−3

Q45.Correct statement about smog is (1) NO2 is present in classical smog (2) Both NO2 and SO2 are present in classical smog (3) Photochemical smog has high concentration of (4) Classical smog also has high concentration of oxidizing agents oxidizing agents

Q45.The octahedral diamagnetic low spin complex among the following is (1) CoNH36 3 + (2) CoF6 3 - (3) CoCl6 3 - (4) NiCl4 2

Q46.Benzyl isocyanide can be obtained by: (A) (B) (C) (D) Choose the correct answer from the options given below: JEE Main 2023 (30 Jan Shift 1) JEE Main Previous Year Paper (1) A and D (2) Only B (3) A and B (4) B and C

Q46.Decreasing order of dehydration of the following alcohols is (1) a > d > b > c (2) b > d > c > a (3) b > a > d > c (4) d > b > c > a

Q46.For conversion of compound A →B, the rate constant of the reaction was found to be 4. 6 × 10−5 Lmol −1 s−1 . The order of the reaction is _____ .

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.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.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.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.An organic compound ' 𝐴 ' with empirical formula C6H6O gives sooty flame on burning. Its reaction with bromine solution in low polarity solvent results in high yield of 𝐵 . 𝐵 is (1) (2) (3) (4)

Q46.Which one of the following reactions does not occur during extraction of copper ? (1) 2 Cu2 S + 3O2 →2 Cu2 O + 2 SO2 (2) 2FeS + 3O2 →2FeO + 2 SO2 (3) CaO + SiO2 →CaSiO3 (4) FeO + SiO2 →FeSiO3

Q46.Consider the following pairs of solution which will be isotonic at the same temperature. The number of pairs of solutions is/ are _____ A. 1 M aq. NaCl and 2 M aq. urea B. 1 M aq. CaCl2 and 1. 5 M aq. KCl C. 1. 5 M aq. AlCl3 and 2 M aq. Na2 SO4 D. 2. 5 M aq. KCl and 1 M aq. Al2(SO4)3 JEE Main 2023 (06 Apr Shift 2) JEE Main Previous Year Paper

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.A sample of a metal oxide has formula M0.83O1.00 . The metal M can exist in two oxidation states +2 and +3. In the sample of M0.83O1.00 , the percentage of metal ions existing in +2 oxidation state is %. (nearest integer) JEE Main 2023 (31 Jan Shift 2) JEE Main Previous Year Paper

Q46.The number of units, which are used to express concentration of solutions from the following is _________. (Mass percent, Mole, Mole fraction, Molarity, ppm, Molality.)

Q46.In the following given reaction 'A' is JEE Main 2023 (24 Jan Shift 1) 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.The number of given statement/s which is/are correct is_____ (A) The stronger the temperature dependence of the rate constant, the higher is the activation energy. (B) If a reaction has zero activation energy, its rate is independent of temperature. (C) The stronger the temperature dependence of the rate constant, the smaller is the activation energy. (D) If there is no correlation between the temperature and the rate constant then it means that the reaction has negative activation energy.

Q46.Solution of 12 g of non-electrolyte (A) prepared by dissolving it in 1000 mL of water exerts the same osmotic pressure as that of 0. 05 M glucose solution at the same temperature. The empirical formula of A is CH2 O. The molecular mass of A is ________g. (Nearest integer)

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

Q46.The major products A and B from the following reactions are : (1) (2) (3) (4)