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?

ChemistryAdvancedHigh School (11–12)Acids, Bases and Salts › pH and Neutralisation JEE Advanced

A $20.0\ \text{mL}$ sample of $0.10\ \text{mol L}^{-1}$ aqueous ammonia is titrated with $0.10\ \text{mol L}^{-1}$ hydrochloric acid at $298\ \text{K}$ . Take $\text{p}K_b(\text{NH}_3) = 4.74$ and $K_w = 1.0 \times 10^{-14}$ , and assume that the volumes add. Which of the following statements are correct?

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← Phosgene breaks down when heated: COCl₂(g) ⇌ CO(g) + Cl₂(g), with Kp = 0.25 bar at 725 K. Pure phosgene is heated to 725 K and comes to equilibrium. All the gases are ideal. Which of the following statements are correct?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? →

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