Neco Model Questions Vol1 2021 Chemistry Question 35

Practice objective / multiple choice question 35 from the 2021 Neco Model Questions Vol1 Chemistry examination.

Neco Model Questions Vol1 2021 Chemistry Objective / Multiple Choice Hard Difficulty
Question 35 NECO_MODEL_QUESTIONS_VOL1 • 2021 • CHEMISTRY • objective

A wastewater stream contains 30 mg L⁻¹ phenol. It undergoes biological treatment where phenol degrades by first‑order kinetics with rate constant \(k = 0.15\ \text{day}^{-1}\) for 5 days. The effluent is then treated by an advanced oxidation process that removes 80 % of the phenol remaining after the biological step. Calculate (a) the phenol concentration after the oxidation step (mg L⁻¹) and (b) the overall percentage removal of phenol from the original stream.

Answer Options

A. (a) 1.5 mg L⁻¹; (b) 95 % removal
B. (a) 14.2 mg L⁻¹; (b) 52.7 % removal
Correct Answer C. (a) 2.8 mg L⁻¹; (b) 90.6 % removal
D. (a) 6.0 mg L⁻¹; (b) 80 % removal
Correct Answer
C
Correct Option:
(a) 2.8 mg L⁻¹; (b) 90.6 % removal

About This Question

This is Neco Model Questions Vol1 2021 Chemistry Question 35. It is one of the objective questions from the 2021 Neco Model Questions Vol1 Chemistry examination.

Difficulty level: Hard .

View More Neco Model Questions Vol1 2021 Chemistry Questions More Neco Model Questions Vol1 Practice Questions Back to Questions

Master the Exam!

You've seen a preview, but there are thousands more questions plus AI tutor to break down complex solutions.

Unlock Full Access Available for Android & Windows
Chat with Support