Question 230General Subjects - Assistant Engineer

The correct answer is D) Heating the oily-water mixture decreases the viscosity of the oil and increases the specific gravity differential between the oil and water. The reasoning behind this is that heating the oily-water mixture decreases the viscosity of the oil, making it easier to separate from the water. Additionally, heating the mixture increases the specific gravity differential between the oil and water, further facilitating the separation process. The other answer choices are incorrect because they do not accurately describe the effects of heating the oily-water mixture. For example, option A is incorrect because heating the mixture actually decreases the viscosity of the oil, not increases it.