Answer:
A. Soluble neutral substance.
Explanation:
A small amount of a dense white powder was mixed with water in a test tube. The white powder did nither sink nor float in the test tube which proves that it is soluble in water that means soluble substance.
The few drops of universal indicator were added in the test tube and the solution turned green in colour which proves that it is neutral substance.
Both the conditions proves that it is soluble neutral substance.
