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

Explanation

Dorji can decide with the help of litmus paper:
(i) The drink which would turn a red litmus blue would be basic.
(ii) If the drink turns a blue litmus to red would be acidic.
(iii) The drink which would not affect both red and blue litmus would be neutral.