Indicators
1)___ substances taste sour. Some examples are curd, lemon juice, tamarind
  

2)___substances taste bitter and feel slippery to the touch
  

3)Acidic substances taste bitter and feel slippery to the touch
  

4)The substances that are used to test whether something is acidic or basic
  

5) is a natural dye extracted from lichens. It is the most commonly used natural indicator

6)Turmeric changes colour to indicate acidic and basic substances. It is in acids and in basic solutions. 

7) A solution of china rose turns green in a basic solution, and bright pink or magenta in an acidic solution. 
  

8)China rose is rain that contains a lot of acid. This acid is created when pollutants in the air, such as carbon dioxide, sulphur dioxide and nitrogen dioxide, dissolve in rainwater, and form acids like carbonic acid, sulphuric acid and nitric acid.
  

9)Acid rain changes colour to indicate acidic and basic substances. It is yellow in acids and red in basic solutions.
  

10)Many substances that you encounter in your daily life have different properties. One major difference between substances is whether they are or


  


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