Indicators are substances whose solutions change colour after being exposed to an acid or a base. There are also indicators that change their smell on exposure to an acid or base, they are known as olfactory indicators.
Indicators can be classified as Natural or Synthetic indicators based on the source from which they are obtained.
How to approach
Questions are generally related to their colour change when exposed to an acidic or basic condition. To solve such questions, you should thoroughly be aware of all the indicators and their respective colour changes.
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