AI-generated practice question — model-generated for extra practice, not a previous-year CBSE board question.
An ore is an accumulation of a mineral mixed with other elements. A mineral deposit is considered an ore when its mineral concentration is sufficient to make extraction commercially viable.
This is a two-part 1-mark question, so keep both parts in one concise sentence or two very short ones. Examiners look for: (1) the definition of ore, and (2) the specific condition — commercial viability / sufficient concentration. Both terms come directly from the textbook passage and must appear in your answer. Avoid writing lengthy explanations about types of minerals or mining methods.