Question

Methyl orange shows _____ colour in acidic solution.

• A. yellow
• B. red
• C. green
• D. blue

Answer 1

The Correct Option is B

Methyl orange is a pH indicator commonly used in titrations because it has a clear and distinct colour change. It works efficiently within the pH range of 3.1 to 4.4.

In an acidic solution, the presence of excess hydrogen ions (H₃O⁺) triggers the colour change of methyl orange to red. This is due to the increased protonation of the indicator, which affects the light absorption spectrum, resulting in the display of a red colour.

To summarize, methyl orange exhibits a red colour in acidic conditions, specifically when the pH is below 3.1.

Solution pH	Indicator Colour
pH < 3.1	Red
pH 3.1 - 4.4	Orange
pH > 4.4	Yellow

Answer 2

Methyl orange is a type of pH indicator used in acid-base titrations. It changes color depending on the pH of the solution:

• In acidic solution, methyl orange turns red.
• In basic solution, it turns yellow.

Therefore, in an acidic environment, methyl orange gives a red color.

Correct Answer: red