Gce Model Questions Vol1 2017 Chemistry Question 14

Practice objective / multiple choice question 14 from the 2017 Gce Model Questions Vol1 Chemistry examination.

Gce Model Questions Vol1 2017 Chemistry Objective / Multiple Choice Hard Difficulty
Question 14 GCE_MODEL_QUESTIONS_VOL1 • 2017 • CHEMISTRY • objective

A lake of volume \(1.0 \times 10^{6}\ \text{L}\) contains lead(II) ions at an initial concentration of \(0.05\ \text{mg L}^{-1}\). Sodium sulfide is added, establishing a sulfide ion concentration of \(1.0 \times 10^{-3}\ \text{M}\). Given the solubility product \(K_{sp}(\text{PbS}) = 8 \times 10^{-28}\), (a) calculate the equilibrium concentration of \(\text{Pb}^{2+}\) after treatment, and (b) determine the mass of lead removed from the lake.

Answer Options

A. [Pb2+] = 5×10⁻²⁴ M, mass removed ≈ 25 g
B. [Pb2+] = 2×10⁻⁶ M, mass removed ≈ 5 g
Correct Answer C. [Pb2+] = 8×10⁻²⁵ M, mass removed ≈ 50 g
D. [Pb2+] = 1×10⁻²⁰ M, mass removed ≈ 0.5 g
Correct Answer
C
Correct Option:
[Pb2+] = 8×10⁻²⁵ M, mass removed ≈ 50 g

About This Question

This is Gce Model Questions Vol1 2017 Chemistry Question 14. It is one of the objective questions from the 2017 Gce Model Questions Vol1 Chemistry examination.

Difficulty level: Hard .

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