Which of the following is a homogeneous mixture?
A. sugar dissolved in water
B. oxygen and nitrogen gases in the air
C. oil and vinegar salad dressing
D. a silver mercury amalgam used to fill a tooth cavity
Answer (2)
a, b and d if you don't count the tooth.
The correct answer is A, sugar dissolved in water, as it is a clear example of a homogeneous mixture where the composition is uniform. Option B, oxygen and nitrogen gases in the air, is also a homogeneous mixture, but A is more straightforward in the context of the question. Options C and D are heterogeneous mixtures and do not represent a uniform composition.
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