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Chemical and Phase Equilibria

30 questions · Chemistry · IIT JAM
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Chemical and Phase Equilibria

30 questions · Chemistry · IIT JAM

  1. A vessel contains 1 mol of gas A and 2 mol of gas B at 2 bar and 25 °C. The gas mixture is compressed such that the final pressure becomes 3 bar without any change in temperature. Considering ideal gas behaviour, the change in Gibbs free…2025 · Q26 · MCQ
  2. Solubility of PbCO 3​ in a buffer of pH 5 is X×10−4. The value of X is ​. (round off to one decimal place) [Given: Ksp​ of PbCO 3​ = 1.5×10−13; for H 2​ CO 3​, Ka1​ = 4.2×10−7…2025 · Q58 · Numerical
  3. The ratio of osmotic pressures of aqueous solutions of 0.01 M BaCl₂ to 0.005 M NaCl is [Given: Both compounds dissociate completely in water]2024 · Q19 · MCQ
  4. Consider the exothermic chemical reaction O₂(g) + 2H₂(g) ⇌ 2H₂O(g) at equilibrium in a closed container. The correct statement(s) is/are2024 · Q37 · Multiple correct
  5. 0.1 M aqueous solution of a weak monobasic acid has pH 2.0. The pKa​ of the monobasic acid is ​. (rounded off to one decimal place)2024 · Q46 · Numerical
  6. A 1.0 L solution is prepared by dissolving 2.0 g of benzoic acid and 4.0 g of sodium benzoate in water. The pH of the resulting solution is ​. (rounded off to one decimal place)2024 · Q55 · Numerical
  7. The total vapour pressure of an ideal binary liquid mixture of benzene and toluene is 0.3 bar. The vapour pressure of pure benzene is 0.5 bar and that of toluene is 0.2 bar. The mole fraction of benzene in this mixture is ​…2024 · Q56 · Numerical
  8. Identify the reaction for which, at equilibrium, a change in the volume of the closed reaction vessel at a constant temperature will not affect the extent of the reaction.2024 · Q6 · MCQ
  9. The vapor pressure of a dilute solution of a non-volatile solute and the vapor pressure of the pure solvent at the same temperature are P and P∗, respectively. P∗P∗−P​ is equal to (Assume that the vapor phase…2023 · Q18 · MCQ
  10. The volume of water (in mL) required to be added to a 100 mL solution (aq. 0.1 M) of a weak acid (HA) at 25 °C to double its degree of dissociation is [Given: Ka​ of HA at 25 °C = 1.8×10−5]2023 · Q19 · MCQ
  11. The following diagram is obtained in a pH-metric titration of a weak dibasic acid (H₂A) with a strong base. The point that best represents [HA⁻] = [A⁻²] is Includes diagram2023 · Q20 · MCQ
  12. The standard Gibbs free energy change for the reaction H_{2}O (g) → H_{2} (g) + ½ O_{2} (g) at 2500 K is +118 kJ mol^{-1}. The equilibrium constant for the reaction is [Given: R = 8.314 J K^{-1} mol^{-1}]2022 · Q30 · MCQ
  13. The pH of an aqueous buffer prepared using CH_{3}COOH and CH_{3}COO^{-}Na^{+} is 4.80. The quantity [CH3​COOH][CH3​COO−]−[CH3​COOH]​ is ​. *(round off to…2022 · Q58 · Numerical
  14. At constant temperature, 6.40 g of a substance dissolved in 78 g of benzene decreases the vapor pressure of benzene from 0.125 atm to 0.119 atm. The molar mass of the substance is ​ g mol^{-1}. *(round off to one…2022 · Q59 · Numerical
  15. A buffer solution is prepared by mixing 0.3 M NH₃ and 0.1 M NH₄NO₃. If K_b of NH₃ is 1.6 × 10⁻⁵ at 25 °C, then the pH (rounded off to one decimal place) of the buffer solution at 25 °C is ​.2021 · Q47 · Numerical
  16. A dilute solution prepared by dissolving a nonvolatile solute in one liter water shows a depression in freezing point of 0.186 K. This solute neither dissociates nor associates in water. The boiling point of the solution in K (rounded off…2021 · Q56 · Numerical
  17. A pure substance **M** has lesser density in solid state than in liquid state. The ΔSfusion​ of **M** is +25 J K−1 mol−1. The CORRECT representative Pressure-Temperature diagram for the fusion of…2021 · Q9 · MCQ
  18. At constant pressure, the μ−T diagram for a pure substance that sublimes is (s=solid, l=liquid and g=gas)2020 · Q11 · MCQ
  19. Sea water containing 1 M NaCl has to be desalinated at 300 K using a membrane permeable only to water. The minimum pressure (in bars) required on the sea-water side of the membrane is ​ (Round off to one decimal…2020 · Q52 · Numerical
  20. The mean ionic activity coefficient for a 0.01 M aqueous solution of Ca₃(PO₄)₂ is ​ (Round off to three decimal places) (Given: log₁₀ γ± = - 0.509 z₊|z₋|√I )2020 · Q56 · Numerical
  21. One liter of a buffer solution contains 0.004 mole of acetic acid (pKₐ = 4.76) and 0.4 mole of sodium acetate. The pH of the solution is ​. (Round off to two decimal places)2019 · Q42 · Numerical
  22. One liter of an aqueous urea solution contains 6 g of urea. The osmotic pressure of the solution at 300 K (assuming an ideal behavior) is ​ kPa. (Round off to one decimal place) [Given: Molecular weight of urea is…2019 · Q53 · Numerical
  23. The solubility of PbI 2​ in 0.10 M KI(aq) is ​× 10 −7 M (rounded up to two decimal places). [The solubility product, Ksp​=7.1×10−9]2018 · Q59 · Numerical
  24. In 200 g of water, 0.01 mole of NaCl and 0.02 mole of sucrose are dissolved. Assuming solution to be ideal, the depression in freezing point of water (in °C) will be ​ (final answer should be rounded off to two…2017 · Q56 · Numerical
  25. The number of degrees of freedom of liquid water in equilibrium with ice is2017 · Q9 · MCQ
  26. At 298 K, 0.1 mol of ammonium acetate and 0.14 mol of acetic acid are dissolved in 1 L of water. The pH of the resulting solution is [Given: pKₐ of acetic acid is 4.75]2016 · Q25 · MCQ
  27. A 10 L flask containing 10.8 g of N₂O₅ is heated to 373 K, which leads to its decomposition according to the equation 2 N₂O₅(g) → 4 NO₂(g) + O₂(g). If the final pressure in the flask is 0.5 atm, then the partial pressure of O₂(g) in atm is…2016 · Q60 · Numerical
  28. At 25 °C, the solubility product (Ksp​) of CaF 2​ in water is 3.2×10−11. The solubility (in mole per kg of water) of the salt at the same temperature (ignore ion pairing) is2015 · Q24 · MCQ
  29. The pK a​ values of H 3​ PO 4​ are 2.12, 7.21 and 12.67. The pH of a phosphate buffer containing 0.2 M NaH 2​ PO 4​ and 0.1 M Na 2​ HPO 4​ is ​2015 · Q48 · Numerical
  30. For the reaction, 2SO 2​ + O 2​ ⇌ 2SO 3​, the equilibrium constant K p​ = 5.0 at 207 °C. If the partial pressures of SO 2​, O 2​ and SO 3​ are 1.0×10−3, 0.20 and 1.0×10−4, respectively, then the Gibbs…2015 · Q49 · Numerical