Practice Questions

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.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.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.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.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.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.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.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.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.Lead storage battery contains 38% by weight solution of H2 SO4 . The van't Hoff factor is 2. 67 at this concentration. The temperature in Kelvin at which the solution in the battery will freeze is _____ (Nearest integer). Given Kf = 1. 8 K kg mol−1

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

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.In the following given reaction 'A' is JEE Main 2023 (24 Jan Shift 1) JEE Main Previous Year Paper (1) (2) (3) (4)

Q47.The standard electrode potential ( M3+/M2+ ) for V, Cr, Mn & Co are −0. 26 V, − 0. 41 V, + 1. 57 V and +1. 97 V , respectively. The metal ions which can liberate H2 from a dilute acid are (1) V2+ and Mn2+ (2) Cr2+ and Co2+ (3) V2+ and Cr2+ (4) Mn2+ and Co2+

Q47.Incorrect method of preparation for alcohols from the following is: (1) Reaction of Ketone with RMgBr followed by (2) Reaction of alkyl halide with aqueous NaOH. hydrolysis. (3) Hydroboration-oxidation of alkene. (4) Ozonolysis of alkene

Q47.A metal surface of 100 cm2 area has to be coated with nickel layer of thickness 0. 001 mm. A current of 2A was passed through a solution of Ni (NO3)2 for ‵x′ seconds to coat the desired layer. The value of x is _________. (Nearest integer) ( ρNi (density of Nickel) is 10 g mL–1, Molar mass of Nickel is 60 g mol−1 F = 96500 Cmol−1 )

Q47.Consider the following sequence of reactions JEE Main 2023 (15 Apr Shift 1) JEE Main Previous Year Paper The product ‘ B’ is (1) (2) (3) (4)

Q47.Match List-I with List-II. 1-Bromopropane is reacted with reagents in List-I to give product in List-II List-I Reagent List-II Product A. KOH (alc) I. Nitrile B. KCN (alc) II. Ester C. AgNO2 III. Alkene D H3CCOOAg IV. Nitroalkane Choose the correct answer from the options given below (1) A-III, B-I, C-IV, D-II (2) A-I, B-II, C-III, D-IV (3) A-I, B-III, C-IV, D-II (4) A-IV, B-III, C-II, D-I

Q47.The number of correct statements from the following is........... A. Ecell is an intensive parameter B. A negative Eo means that the redox couple is a stronger reducing agent than the H+/H2 couple. C. The amount of electricity required for oxidation or reduction depends on the stoichiometry of the electrode reaction. D. The amount of chemical reaction which occurs at any electrode during electrolysis by a current is proportional to the quantity of electricity passed through the electrolyte.

Q47.Reaction of thionyl chloride with white phosphorus forms a compound [A] , which on hydrolysis gives [B] , a dibasic acid. [A] and [B] are respectively (1) P4O6 and H3 PO3 (2) PCl3 and H3 PO3 (3) PCl5 and H3 PO4 (4) POCl3 and H3 PO4

Q47.The electrode potential of the following half cell at 298 K X X2+(0. 001M)∥Y2+(0. 01M) Y is _____ ×10−2 V (Nearest integer) Given : E0 = −2. 36 V X2+∣X E0 = +0. 36 V Y2+Y 2.303 RT = 0. 06 V F

Q47.A student has studied the decomposition of a gas AB3 at 25°C . He obtained the following data p (mm Hg) 50 100 200 400 Relative t 1 (s) 4 2 1 0. 5 2 The order of the reaction is JEE Main 2023 (24 Jan Shift 2) JEE Main Previous Year Paper (1) 0. 5 (2) 2 (3) 1 (4) 0 (zero)