Question

a mixture can be: a either homogeneous or heterogeneous b element or compound c only homogeneous d only heterogeneous

Explanation:

• Option A: Mixtures are classified as either homogeneous (uniform composition, like salt water) or heterogeneous (non - uniform composition, like a salad).
• Option B: Elements and compounds are pure substances, not mixtures.
• Option C: Mixtures can be heterogeneous too, so saying "only homogeneous" is wrong.
• Option D: Mixtures can be homogeneous too, so saying "only heterogeneous" is wrong.

Answer:

A. Either homogeneous or heterogeneous