Question

Consider the following statements:
(A) Both acids and bases change the colour of all the indicators.
(B) If an indicator gives colour change with an acid, it does not give a change with a base.
(C) If an indicator changes colour with a base, it does not change colour with an acid.
(D) Change of colour in an acid and a base depends on the type of the indicator.
Which of these statements are correct?
(a) All four
(b) A and D
(c) B, C, and D
(d) Only d

Answer 1

Hint : Indicators are defined as the chemical compounds that will lead to colour change in accordance to pH of the solution they are added in. they are mainly used to determine the ph of the body that is basicity and /or acidity.

Complete Step By Step Answer:
All the indicators will not change colour with acid as well as base
For example, consider turmeric, it will change its colour to pink when reacted with base and will remain yellow with acid.
Hence the option D is the correct option.

Additional Information:
There are different types of indicators; natural indicators and synthetic indicators. Natural indicators are the ones which are available in nature for example; beetroot, turmeric etc and artificial or synthetic indicators are the ones made by man for example; phenolphthalein, methyl orange, etc.

Note :
The substance which gives us different colours in a different medium and hence indicates the presence of acid or base in the given solution. These indicators are majorly used in titrations in analytical chemistry and in biology to study the extent of a chemical reaction.