Which of the following statements about minerals is true?

• A. Minerals are formed only by biological processes.
• B. Minerals have a definite chemical composition and crystalline structure.
• C. Minerals can be liquids at room temperature.
• D. Minerals are always organic compounds.

Answer: (B)

Verified step by step guidance

1. Understand the definition of minerals in chemistry and geology: Minerals are naturally occurring, inorganic solids with a definite chemical composition and an ordered atomic arrangement (crystalline structure).
2. Evaluate the first statement: "Minerals are formed only by biological processes." Since minerals are typically inorganic and can form through geological processes without biological involvement, this statement is false.
3. Consider the second statement: "Minerals have a definite chemical composition and crystalline structure." This aligns with the standard definition of minerals, making it true.
4. Analyze the third statement: "Minerals can be liquids at room temperature." Minerals are solids by definition, so this statement is false.
5. Review the fourth statement: "Minerals are always organic compounds." Minerals are inorganic by definition, so this statement is false.