Practice Questions

Q55.When Fe0 . 93O is heated in presence of oxygen, it converts to Fe2O3. The number of correct statement/s from the following is ______ . A. The equivalent weight of Fe0 . 93O is Molecular0 . 79weight B. The number of moles of Fe2 + and Fe3 + in 1 mole of Fe0 . 93O is 0 . 79 and 0 . 14 respectively. C. Fe0 . 93O is metal deficient with lattice comprising of cubic closed packed arrangement of O2 - ions. D. The % composition of Fe2 + and Fe3 + in Fe0 . 93O is 85% and 15% respectively. Q56.5 g of NaOH was dissolved in deionized water to prepare a 450 mL stock solution. What volume (in mL) of this solution would be required to prepare 500 mL of 0 . 1 M solution ? Given : Molar Mass of Na, O and H is 23, 16 and 1 g mol – 1 respectively

Q55.The number of incorrect statement/s about the black body from the following is______ (A) Emit or absorb energy in the form of electromagnetic radiation. (B) Frequency distribution of the emitted radiation depends on temperature. (C) At a given temperature, intensity vs frequency curve passes through a maximum value. JEE Main 2023 (10 Apr Shift 1) JEE Main Previous Year Paper (D) The maximum of the intensity vs frequency curve is at a higher frequency at higher temperature compared to that at lower temperature.

Q55.The spin only magnetic moment of [Mn (H2O)6]2+ complexes is B. M. (Nearest integer) (Given atomic number of Mn = 25) JEE Main 2023 (01 Feb Shift 2) JEE Main Previous Year Paper

Q55.The total number of chiral compound/s from the following is Q56.25 mL of an aqueous solution of KCl was found to require 20 mL of 1M AgNO3 solution when titrated using K2CrO4 as an indicator. What is the depression in freezing point of KCl solution of the given concentration? (Nearest integer). (Given : Kf = 2 . 0 K kg mol-1 ) Assume 1) 100% ionization and 2) density of the aqueous solution as 1 g mL-1

Q55. A in the above reaction is : JEE Main 2023 (12 Apr Shift 1) JEE Main Previous Year Paper (1) (2) (3) (4)

Q55.Find out the major product from the following reaction. JEE Main 2023 (06 Apr Shift 2) JEE Main Previous Year Paper (1) (2) (3) (4)

Q55.The Cl −Co −Cl bond angle values in a fac- [Co (NH3)3 Cl3] complex is/are: (1) 90° & 180° (2) 90° (3) 180° (4) 90° & 120° JEE Main 2023 (30 Jan Shift 2) JEE Main Previous Year Paper

Q55.If the formula of Borax is Na2 B4O𝑥( OH ) 𝑦· zH2O, then x + y + z = ______ Q56.0 . 400 g of an organic compound ( X ) gave 0 . 376 g of AgBr in Carius method for estimation of bromine. % of bromine in the compound ( 𝑋) is (Given: Molar mass AgBr = 188 g mol-1 Br = 80 g mol-1

Q55.Find out the major products from the following reactions. JEE Main 2023 (24 Jan Shift 2) JEE Main Previous Year Paper (1) (2) (3) (4)

Q55.An atomic substance A of molar mass 12 g mol – 1 has a cubic crystal structure with edge length of 300 pm. The no. of atoms present in one unit cell of A is (Nearest integer) Given the density of A is 3 . 0 g m m-1 and NAA = 6 . 02 × 1023 mol-1 Q56.0 . 004 M K2SO4 solution is isotonic with 0 . 01 M glucose solution. Percentage dissociation of K2SO4 is _____ (Nearest integer) = m Volt and

Q55.Consider the graph of Gibbs free energy G vs extent of reaction. The number of statement/s from the following which are true with respect to points (a), (b) and (c) is ______ A. Reaction is spontaneous at (a) and (b) B. Reaction is at equilibrium at point (b) and non-spontaneous at point (c) C. Reaction is spontaneous at (a) and non-spontaneous at (c) D. Reaction is non-spontaneous at (a) and (b)

Q55.In the reaction given below ′B′ is: JEE Main 2023 (13 Apr Shift 1) JEE Main Previous Year Paper (1) (2) (3) (4)

Q55.A solution containing 2 g of a non-volatile solute in 20 g of water boils at 373 . 52 K. The molecular mass of the solute is _____ gmol-1. (Nearest integer) Given, water boils at 373 K, Kb for water = 0 . 52K kg mol-1

Q55.Cyclohexylamine when treated with nitrous acid yields (P). On treating (P) with PCC results in (Q). When (Q) is heated with dil. NaOH we get (R) The final product (R) is: (1) (2) (3) (4)

Q55.The sum of oxidation state of the metals in Fe(CO)5 , VO2+ and WO3 is

Q55.The total pressure of a mixture of non-reacting gases X ( 0 . 6 g ) and Y ( 0 . 45 g ) in a vessel is 740 mm of Hg. The partial pressure of the gas X is mm of Hg . (Nearest Integer) (Given : molar mass X = 20 and Y = 45 g mol-1 )

Q56.The structures of major products A, B and C in the following reaction are sequence. (1) (2) (3) (4)

Q56.The increasing order of pKa for the following phenols is (A) 2,4-Dinitrophenol (B) 4-Nitrophenol (C) 2,4,5-Trimethylphenol (D) Phenol (E) 3-Chlorophenol Choose the correct answer from the option given below : JEE Main 2023 (29 Jan Shift 1) JEE Main Previous Year Paper (1) (A), (E), (B), (D), (C) (2) (A), (B), (E), (D), (C) (3) (C), (D), (E), (B), (A) (4) (C), (E), (D), (B), (A)

Q56. In the above reaction, left hand side and right hand side rings are named as ‵A′ and ‵B′ respectively. They undergo ring expansion. The correct statement for this process is: (1) Ring expansion can go upto seven membered (2) Finally both rings will become six membered rings each. (3) Finally both rings will become five membered (4) Only A will become 6 membered. each.

Q56.The magnetic moment is measured in Bohr Magneton (BM). Spin only magnetic moment of Fe in [Fe (H2O)6]3+ and [Fe (CN)6]3− complexes respectively is: (1) 6. 92 B. M. in both (2) 3. 87 B. M. and 1. 732 B. M. (3) 5. 92 B. M. and 1. 732 B. M. (4) 4. 89 B. M. and 6. 92 B. M.

Q56.The correct order of reactivity of following haloarenes towards nucleophilic substitution with aqueous NaOH is: Choose the correct answer from the options given below: (1) A > B > D > C (2) C > A > D > B (3) D > C > B > A (4) D > B > A > C

Q56.Find out the major products from the following reaction sequence. JEE Main 2023 (29 Jan Shift 2) JEE Main Previous Year Paper (1) (2) (3) (4)

Q56.Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason R Assertion A:- Butylated hydroxyl anisole when added to butter increases its shelf life. Reason R:- Butylated hydroxyl anisole is more reactive towards oxygen than food. In the light of the above statements, choose the most appropriate answer from the options given below:- (1) Both A and R are correct and R is the correct (2) A is correct but R is not correct. explanation of A. (3) A is not correct but R is correct. (4) Both A and R are correct but R is NOT the correct explanation of A.

Q56.In alkaline medium, the reduction of permanganate anion involves a gain of ____________ electrons.

Q56.Identify the product formed ( A and E ) (1) (2) (3) (4)