Question

identify the reason a catalytic converter can fail when a catalyst becomes coated by a substance such as lead from leaded fuel. a. contamination b. overheating c. old age d. wear

Explanation:

When a catalyst in a catalytic converter is coated by a substance like lead (from leaded fuel), this is a case of contamination. Contamination means an unwanted substance (here, lead) covers the catalyst, preventing it from effectively facilitating the chemical reactions it is supposed to (like converting harmful exhaust gases). Overheating would involve excessive temperature - related damage, old age is a general term not specific to this coating scenario, and wear implies physical abrasion rather than coating by an external substance.

Answer:

A. Contamination