Practice Questions

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

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

Q46.Which of these reactions is not a part of breakdown of ozone in stratosphere? (1) ⊙ ⊙ (2) ⊙ ⊙ 2 Cl O(g) →ClO2(g) + Cl(g) ClO(g) + O(g) →O2(g) + Cl (3) ⊙ ⊙ (4) uv ⊙ ⊙ Cl(g) + O3(g) →O2(g) + ClO(g) CF2 Cl2(g) → Cl(g) + CF2 Cl(g)

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.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.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.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.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

Q47.Suitable reaction condition for preparation of Methyl phenyl ether is (1) PhO⊝Na⊕, MeOH (2) Benzene, MeBr (3) Ph - Br, MeO⊖Na⊕ (4) PhO⊝Na⊕, MeBr

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.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.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.Consider the following reaction ( i ) dil . NaOH Propanal + Methanal = → Product B (ii) Δ(iii) NaCN(iv) H3O+ ( C5H8O3 ) The correct statement for product 𝐵 is. It is JEE Main 2023 (31 Jan Shift 1) JEE Main Previous Year Paper (1) optically active and adds one mole of bromine (2) racemic mixture and is neutral (3) racemic mixture and gives a gas with saturated (4) optically active alcohol and is neutrall NaHCO3 solution

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)

Q47.In the following reaction, ‘A’ is JEE Main 2023 (01 Feb Shift 1) JEE Main Previous Year Paper (1) (2) (3) (4)

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.If the boiling points of two solvents X and Y (having same molecular weights) are in the ratio 2: 1 and their enthalpy of vaporizations are in the ratio 1 : 2, then the boiling point elevation constant of X is m times the boiling point elevation constant of Y . The value of m is (nearest integer).

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