Question

define the following
1.indicator 2. acid​

Answer 1

1) The substances that indicates whether the solution is acidic or basic in nature are called indicators.

Ex:- Phenolphthalein, litmus paper

2) The chemical substances that are acidic in nature and have a sour taste are called acids.

ex:- lemon, grapes, orange

Answer 2

Answer:

1. indicator: Indicators are substances which show a change in colour when brought in contract with acids and bases. These indicators indicate the nature of a substance by colour change.
2. acid: a liquid substance that can dissolve metal and may burn your skin or clothes. Acids have a pH value of less than 7