What illegal question may have been asked in an interview?

Asking about a candidate's age during an interview can be considered illegal because it may result in age discrimination. The Age Discrimination in Employment Act (ADEA) protects individuals who are 40 years of age or older from employment discrimination based on age. Inquiring about a candidate's age could lead employers to make assumptions about their experience and adaptability, which can unfairly bias the hiring decision against older applicants.

While questions related to salary expectations or marital status might be sensitive or inappropriate in some contexts, they are not explicitly illegal. Questions about disabilities are also regulated under the Americans with Disabilities Act (ADA) and should not be asked unless there's a legitimate reason related to job performance and accommodations. Overall, the focus on age represents a significant legal concern in hiring practices, making it the best example of an illegal interview question.