Question

The indicators litmus paper, phenolphthalein an methyl orange are commonly used in

• A. hospitals
• B. homes
• C. laboratories
• D. airports

Answer 1

The correct option is C

laboratories

Explanation of correct option:

• Indicators are the chemicals that are used to identify the acidic or basic nature of substances.
• So, they are most commonly used in laboratories where tests are performed to do qualitative analysis of the given sample.
• Qualitative analysis is the concerned with the presence or absence of certain ions.

Explanation of incorrect options:

As we are not concerned with the qualitative analysis of acids and bases in hospitals, homes or airports, indicators like litmus paper, phenolphthalein an methyl orange are not used in these places.

Therefore, option (c) is correct.