Waec Model Questions Vol1 2024 Chemistry Question 13

Practice objective / multiple choice question 13 from the 2024 Waec Model Questions Vol1 Chemistry examination.

Waec Model Questions Vol1 2024 Chemistry Objective / Multiple Choice Hard Difficulty
Question 13 WAEC_MODEL_QUESTIONS_VOL1 • 2024 • CHEMISTRY • objective

A factory discharges effluent into a river. The effluent flow rate is 200 L s⁻¹ and contains phenol at 0.50 mg L⁻¹. The river flow rate is 2.0×10⁵ L s⁻¹ and its upstream phenol concentration is 0.05 mg L⁻¹. The river velocity is 0.4 m s⁻¹. After travelling 8 km downstream, the phenol concentration is measured as 0.030 mg L⁻¹. Assuming first‑order degradation of phenol during the travel, determine (a) the percentage removal of phenol over the 8 km stretch, (b) the first‑order rate constant k (in h⁻¹), and (c) the mass of phenol removed per day (in kg).

Answer Options

Correct Answer A. 40.6 % removal, k = 0.094 h⁻¹, 354.6 kg per day
B. 45.0 % removal, k = 0.120 h⁻¹, 400.5 kg per day
C. 35.2 % removal, k = 0.080 h⁻¹, 300.0 kg per day
D. 50.1 % removal, k = 0.150 h⁻¹, 500.2 kg per day
Correct Answer
A
Correct Option:
40.6 % removal, k = 0.094 h⁻¹, 354.6 kg per day

About This Question

This is Waec Model Questions Vol1 2024 Chemistry Question 13. It is one of the objective questions from the 2024 Waec Model Questions Vol1 Chemistry examination.

Difficulty level: Hard .

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