which of the following ingredients produce a heterogeneous mixture when mixed together

Among common ingredient combinations, oil and water produce a heterogeneous mixture when mixed together because they do not dissolve into each other and form separate layers. Other combinations like sugar and water, or salt and vinegar, result in homogeneous mixtures because the solutes dissolve uniformly in the solvents. Molten copper and zinc typically form an alloy, which is homogeneous when solidified. Thus, oil and water are the ingredients that produce a heterogeneous mixture when mixed together.