What is the colour change of a universal indicator when mixed with raw cow's milk?
A. Green
B. Blue
C. Red
D. Violet

Hint: A Universal indicator is nothing but a pH indicator which is composed of a solution of different compounds that exhibits few smooth colour variations over a pH value ranging from 1 to 14 indicating the acidity or alkalinity of solutions.

Complete step by step answer:
It turns green in the existence of a neutral compound. Raw cow's milk has neither acidic nature nor basic effect on the body therefore it is neutral. Thus, the universal indicator converts to green colour when it gets mixed with raw cow's milk.

Hence, Option A is correct.

Additional information:
A Universal indicator is nothing but pH indicator which is composed of a solution of different compounds that exhibits few smooth colour variations over a pH value ranging from 1 to 14 indicating the acidity or alkalinity of solutions.
The main sources of a universal indicator, in the solution form, are thymol blue, methyl red, bromothymol blue, and phenolphthalein which contribute as main components. This mixture is essential as each component loses or gains protons depending upon the acidity or alkalinity of the solution after being tested.One example of a universal indicator is red cabbage juice.Raw milk does not go through pasteurization or homogenization.
It comes from cows but also goats, sheep, buffalos or even camels.Raw milk is rich in nutrient beverages that give benefits to your health in many ways. It's packed with precious, vital nutrients such as calcium, vitamins, healthy fats, minerals, and iron. Plus, it's an amazing source of raw protein

Note:
Raw milk of cows is neither acidic in nature nor it has a basic effect on the body therefore it is neutral in nature.