Class 10th Science Chapter 2 Sour liquid-Acidic in nature, Bitter liquid - Basic in nature If you are having acidity among Lemon, Vinegar , Baking soda , you should take Baking Soda coz its Basic in nature other 2 are acidic in nature. Acid turns Blue litmus paper into Red. Basic does opposite . Litmus Paper is made by soaking the absorbing paper in litmus solution (dye extracted from lichen((fungi+alga) living together as 1. Lichen is a plant belonging to the division Thallophyta,)) When the litmus solution is neither acidic nor basic, its colour is purple. There are many other natural materials like red cabbage leaves, turmeric, coloured petals of some flowers such as Hydrangea , Petunia and Geranium , which indicate the presence of acid or base in a solution. These are called acid-base indicators or sometimes simply indicators Q U E S T I O N 1. You have been provided with three test tubes. One of them contains d...