Question

which of these is a homogeneous mixture? a air b salad c sand d granite

Explanation:

A homogeneous mixture has a uniform composition throughout. Air is a mixture of gases (like nitrogen, oxygen, etc.) that is uniform in composition. Salad (B) has different components (vegetables, dressing, etc.) with non - uniform distribution. Sand (C) may have different sized particles and impurities with non - uniform distribution. Granite (D) is a heterogeneous mixture with different mineral components visible.

Answer:

A. Air