Question

A chemical substance indicates completion of the reacting solution by sharp change in its color
is called
1. catalyst. 2. an indicator 3.an inhibitor 4. reagent​

Answer 1

Answer:

an indicator is the answer

Answer 2

An indicator is a chemical substance which indicates "completion of the reacting solution by a changes in its colour".

Explanation:

• Indicator is a substance which indicates the presence and the concentration of an acid or alkali in a particular solution. This can be better explained by an example.
• Methyl yellow is an indicator which emits yellow colour in an alkali base solution. As the acid is added to the solution, it starts to turn red.
• Indicators like methyl yellow need not be in higher concentrations to show changes.
• Therefore even with minute quantities, they can effectively indicate the characteristics of a solution without altering anything.