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Answer 1

Explanation:

acid is a substance that in water solution taste sour change the colour of certain indicator

Answer 2

Answer:

1) a base is a substance which when dissolved in water gives (OH-) ions in the solution and bases are bitter in taste...

2) a acid is a substance which when dissolved in water gives (H+) ions in the solution and acids are sour in taste...

3) litmus paper is a type of indicator which is used to test the substance whether it is acidic or basic . litmus paper is extracted from lichen...

4) crystallisation is a process by which chemicals which is in a liquid form converted from a liquid solution to. a solid crystalline state

hope it's help ✌✌

are you really in 12th. class? these are the questions of class 8th