Question

Dorji has a few bottles of soft drink in his restaurant. But, unfortunately, these are not labelled. He has to serve the drinks on the demand of customers. One customer wants acidic drink, another wants basic and third one wants neutral drink. How will Dorji decide which drink is to be served to whom?

Answer 1

Dorji can use litmus test on these drinks. Just drop few drops of drink on litmus paper and take the decision according to the following:
1. If it turns blue, drink is basic.
2. If it turns red, drink is acidic.
3. If it turns green, drink is neutral.