202360 marks17 questions
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Source: JEE (Advanced) 2023, Paper 2, Chemistry, published by JEE (Advanced). The official PDF
Consider the following statements related to colloids. (I) Lyophobic colloids are not formed by simple mixing of dispersed phase and dispersion medium. (II) For emulsions, both the dispersed phase and the dispersion medium are liquid. (III) Micelles are produced by dissolving a surfactant in any solvent at any temperature. (IV) Tyndall effect can be observed from a colloidal solution with dispersed phase having the same refractive index as that of the dispersion medium. The option with the correct set of statements is
The complex(es), which can exhibit the type of isomerism shown by [Pt(NH₃)₂Br₂], is(are) [en = H₂NCH₂CH₂NH₂]
H₂S (5 moles) reacts completely with acidified aqueous potassium permanganate solution. In this reaction, the number of moles of water produced is x, and the number of moles of electrons involved is y. The value of (x + y) is ____.
Among [I₃]⁺, [SiO₄]⁴⁻, SO₂Cl₂, XeF₂, SF₄, ClF₃, Ni(CO)₄, XeO₂F₂, [PtCl₄]²⁻, XeF₄, and SOCl₂, the total number of species having sp³ hybridised central atom is ______.
Consider the following molecules: Br₃O₈, F₂O, H₂S₄O₆, H₂S₅O₆, and C₃O₂. Count the number of atoms existing in their zero oxidation state in each molecule. Their sum is____.
For He⁺, a transition takes place from the orbit of radius 105.8 pm to the orbit of radius 26.45 pm. The wavelength (in nm) of the emitted photon during the transition is ___. [Use: Bohr radius, a = 52.9 pm; Rydberg constant, R_H = 2.2 × 10⁻¹⁸ J; Planck’s constant, h = 6.6 × 10⁻³⁴ J s; Speed of light, c = 3 × 10⁸ m s⁻¹]
50 mL of 0.2 molal urea solution (density = 1.012 g mL⁻¹ at 300 K) is mixed with 250 mL of a solution containing 0.06 g of urea. Both the solutions were prepared in the same solvent. The osmotic pressure (in Torr) of the resulting solution at 300 K is ___. [Use: Molar mass of urea = 60 g mol⁻¹; gas constant, R = 62 L Torr K⁻¹ mol⁻¹; Assume, ΔmixH = 0, ΔmixV = 0]
The reaction of 4-methyloct-1-ene (P, 2.52 g) with HBr in the presence of (C₆H₅CO)₂O₂ gives two isomeric bromides in a 9 : 1 ratio, with a combined yield of 50%. Of these, the entire amount of the primary alkyl bromide was reacted with an appropriate amount of diethylamine followed by treatment with aq. K₂CO₃ to give a non-ionic product S in 100% yield. The mass (in mg) of S obtained is ___. [Use molar mass (in g mol⁻¹): H = 1, C = 12, N = 14, Br = 80]