The chemical engineer shall express his professional opinion only when

• A. He is adequately informed of the facts related thereto.
• B. The purposes for which the opinion is asked is known by him
• C. None of the above
• D. A and b

Answer: (D)

In professional practice, a chemical engineer should express a professional opinion only when both the necessary facts are known and the purpose of the opinion is clear. Being adequately informed means you understand the technical data, assumptions, uncertainties, and how the issue relates to safety, compliance, and performance. Knowing the purpose means you understand why the opinion is being sought, how it will be used in the decision, and the scope and boundaries of your responsibility. When both conditions are met, the opinion is grounded, relevant, and less likely to be misused or misinterpreted. If either factor is missing, the opinion can be incomplete or biased, which risks unsafe outcomes, poor decisions, and damage to professional integrity.