- [Medium]In the reaction H_2O + NH_3 \rightleftharpoons OH^- + NH_4^+, which pair correctly identifies the conjugate acid-base pairs?...
- [Medium]For an endothermic reaction at 400 K, K_c = 2.0 \times 10^{-3}. When the temperature is raised to 600 K, which of the following best describes the cha...
- [Easy]At 25°C, the ionic product of water K_w = 1.0 \times 10^{-14}. What is the pOH of a solution whose [H^+] = 10^{-3} M?...
- [Easy]According to the Lewis acid-base theory, which of the following species acts as a Lewis acid in the reaction BF_3 + :NH_3 \rightarrow F_3B-NH_3?...
- [Medium]For the reaction CO(g) + 3H_2(g) \rightleftharpoons CH_4(g) + H_2O(g), what will happen to the equilibrium position when the total pressure is increas...
- [Medium]At equilibrium, 20% of N_2O_4 is dissociated into NO_2 according to N_2O_4(g) \rightleftharpoons 2NO_2(g). If the initial concentration of N_2O_4 is 0...
- [Medium]At 600 K, K_c for the reaction H_2(g) + I_2(g) \rightleftharpoons 2HI(g) is 64. If [H_2] = 0.5 M, [I_2] = 0.5 M, and [HI] = 4 M are the initial concen...
- [Easy]Which of the following aqueous salt solutions will be basic (pH > 7) at 25°C due to hydrolysis of its ions?...
- [Medium]The solubility of AgCl in 0.1 M NaCl solution is much lower than its solubility in pure water. If K_{sp}(AgCl) = 1.8 \times 10^{-10}, what is the mola...
- [Easy]The solubility of BaSO_4 in water at 25°C is 1.05 \times 10^{-5} mol L^{-1}. What is the value of its solubility product K_{sp}?...
- [Easy]For the reversible reaction N_2(g) + 3H_2(g) \rightleftharpoons 2NH_3(g), the equilibrium constant expression K_c is correctly written as which of the...
- [Medium]A 0.1 M acetic acid solution has a degree of dissociation of 1.34 \times 10^{-2} at 25°C. What is the dissociation constant K_a of acetic acid?...
- [Easy]What is the pH of a 0.01 M solution of HCl, a strong acid that completely dissociates in water at 25°C?...
- [Easy]Consider the exothermic equilibrium reaction 2SO_2(g) + O_2(g) \rightleftharpoons 2SO_3(g). Which single change will shift the equilibrium to the righ...
- [Medium]At 500 K, the equilibrium constant K_c for the reaction PCl_5(g) \rightleftharpoons PCl_3(g) + Cl_2(g) is 1.8 \times 10^{-2}. What is the value of K_p...
- [Medium]For the reaction PCl₅(g) ⇌ PCl₃(g) + Cl₂(g), the relationship between Kp and Kc is:...
- [Easy]At 25°C, the ionic product of water (Kw) is 1.0 × 10⁻¹⁴. The pH of pure water at this temperature is:...
- [Easy]A buffer solution is prepared by mixing 0.1 M CH₃COOH and 0.1 M CH₃COONa. If Ka for acetic acid is 1.8 × 10⁻⁵, the pH of the buffer is:...
- [Medium]The solubility product of AgCl at 298 K is 1.0 × 10⁻¹⁰. The solubility of AgCl in water is:...
- [Easy]The solubility of AgCl decreases in the presence of:...
- [Easy]The pH of a 0.01 M solution of HCl is:...
- [Medium]According to Ostwald's dilution law, the degree of dissociation of a weak electrolyte is:...
- [Easy]An aqueous solution of NH₄Cl is:...
- [Easy]Phenolphthalein is a suitable indicator for titration between:...
- [Easy]The conjugate base of H₂PO₄⁻ is:...
- [Medium]In a solution containing both AgCl and AgBr, if Ksp(AgCl) = 10⁻¹⁰ and Ksp(AgBr) = 10⁻¹³, which compound will precipitate first when Ag⁺ ions are added...
- [Medium]For a weak acid HA with Ka = 4 × 10⁻⁵ and concentration 0.1 M, the degree of ionization is approximately:...
- [Medium]At 500 K, for the reaction PCl₅(g) ⇌ PCl₃(g) + Cl₂(g), if the degree of dissociation is 0.4 and initial concentration of PCl₅ is 1 M, the value of Kc ...
- [Easy]For the reaction N₂(g) + 3H₂(g) ⇌ 2NH₃(g), the expression for equilibrium constant Kc is:...
- [Medium]For the exothermic reaction N₂(g) + 3H₂(g) ⇌ 2NH₃(g), which change will shift the equilibrium to the right?...