A solution at 298 K contains 0.010 mol L⁻¹ each of Cu²⁺ and Fe²⁺, and 0.30 mol L⁻¹ hydrochloric acid. It is saturated with hydrogen sulfide, so that [H₂S] = 0.10 mol L⁻¹. For H₂S, K_a1 = 9.1 × 10⁻⁸ and K_a2 = 1.2 × 10⁻¹³. Take Ksp(CuS) = 6.3 × 10⁻³⁶ and Ksp(FeS) = 6.3 × 10⁻¹⁸. Which of the following statements are correct?

ChemistryAdvancedHigh School (11–12)Acids, Bases and Salts › Salts and Their Uses JEE Advanced

A solution at $298\ \text{K}$ contains $0.010\ \text{mol L}^{-1}$ each of $\text{Cu}^{2+}$ and $\text{Fe}^{2+}$ , and $0.30\ \text{mol L}^{-1}$ hydrochloric acid. It is saturated with hydrogen sulfide, so that $[\text{H}_2\text{S}] = 0.10\ \text{mol L}^{-1}$ . For $\text{H}_2\text{S}$ , $K_{a1} = 9.1 \times 10^{-8}$ and $K_{a2} = 1.2 \times 10^{-13}$ . Take $K_{sp}(\text{CuS}) = 6.3 \times 10^{-36}$ and $K_{sp}(\text{FeS}) = 6.3 \times 10^{-18}$ . Which of the following statements are correct?

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← A 20.0 mL sample of 0.10 mol L⁻¹ aqueous ammonia is titrated with 0.10 mol L⁻¹ hydrochloric acid at 298 K. Take pKb(NH₃) = 4.74 and Kw = 1.0 × 10⁻¹⁴, and assume that the volumes add. Which of the following statements are correct?At 298 K, the standard Gibbs energies of formation are NO₂(g) +51.3 kJ mol⁻¹ and N₂O₄(g) +97.9 kJ mol⁻¹. A vessel at 298 K holds N₂O₄ at 0.90 bar and NO₂ at 0.15 bar. For N₂O₄(g) ⇌ 2 NO₂(g) in this mixture, which statement is correct? Take R = 8.314 J K⁻¹ mol⁻¹. →

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