NEET UG · Chemistry

Chemical and Ionic Equilibrium

17 practice questions, each with the answer and an explanation.

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Random questions from this topic, one at a time. You see the answer and the explanation straight after each one.

All 17 questions

  1. For the gaseous equilibrium: N2(g) + 3 H2(g) <=> 2 NH3(g) at 500 K, what is the mathematical relationship between the equilibrium constant in terms of partial pressures (Kp) and the equilibrium consta…
  2. For the endothermic decomposition of solid calcium carbonate: CaCO3(s) <=> CaO(s) + CO2(g) in a closed container, how will the equilibrium position respond to an increase in total pressure and an incr…
  3. What happens when an inert gas (such as argon or helium) is added to a gaseous equilibrium system at constant volume?
  4. According to the Bronsted-Lowry acid-base theory, what are the conjugate acid and conjugate base of the amphiprotic hydrogen sulfate ion (HSO4-)?
  5. At 373 K (100°C), the ionic product of water (Kw) increases to approximately 1.0 * 10^-12. What is the pH of pure, neutral water at this elevated temperature?
  6. What is the pH of a 0.001 M aqueous hydrochloric acid (HCl) solution at 298 K?
  7. What is the pH of a 0.05 M aqueous solution of a weak monoprotic acid HA having an acid dissociation constant Ka = 2.0 * 10^-5 at 298 K?
  8. Which mixture constitutes an effective acidic buffer solution capable of maintaining a stable pH when small amounts of acid or base are added?
  9. What is the calculated pH of a buffer solution prepared by mixing 0.1 M ethanoic acid (acetic acid, pKa = 4.76) with 0.1 M sodium ethanoate (sodium acetate) at 298 K?
  10. Why is the aqueous solution of ammonium acetate (CH3COONH4), a salt of a weak acid and a weak base, nearly neutral (pH ≈ 7.0) at 298 K?
  11. If the solubility of calcium fluoride (CaF2, molar mass M) in pure water is S mol/L at 298 K, what is the correct algebraic relationship between its solubility product (Ksp) and S?
  12. The solubility product (Ksp) of silver chloride (AgCl) is 1.0 * 10^-10 at 298 K. What is the molar solubility of AgCl in a 0.1 M aqueous sodium chloride (NaCl) solution?
  13. In qualitative inorganic salt analysis, why is dilute hydrochloric acid (HCl) added prior to passing hydrogen sulfide (H2S) gas to selectively precipitate Group II cations (such as Cu2+, Pb2+, and As3…
  14. In qualitative inorganic analysis, why is ammonium chloride (NH4Cl) added to the solution prior to adding ammonium hydroxide (NH4OH) when precipitating Group III cations (Fe3+, Al3+, Cr3+)?
  15. What is the pH of an aqueous solution formed by the hydrolysis of sodium cyanide (NaCN), a salt of a strong base (NaOH) and a weak acid (HCN)?
  16. Under which condition will precipitation of an insoluble salt occurring from mixing two electrolyte solutions strictly take place?
  17. What is the relationship between the equilibrium constant of a forward reaction (K) and the equilibrium constant of the reverse reaction (K')?

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