A universal indicator shows violet colour in a solution. What does this indicate?
Answer and explanation
Correct answer: Strong basicity
Universal-indicator colours are related to pH. Violet or purple is found at the high-pH end of the indicator scale, so it indicates a strongly basic or alkaline solution. Hence option C is correct. Strong acids are represented by red shades, neutrality near pH 7 by green, and the colour change itself requires an aqueous ionic environment; it does not mean that no ions are present. The exact pH depends on the indicator chart and concentration.
Frequently asked questions
What is the correct answer to this question?
Strong basicity
Why is this the correct answer?
Universal-indicator colours are related to pH. Violet or purple is found at the high-pH end of the indicator scale, so it indicates a strongly basic or alkaline solution. Hence option C is correct. Strong acids are represented by red shades, neutrality near pH 7 by green, and the colour change itself requires an aqueous ionic environment; it does not mean that no ions are present. The exact pH depends on the indicator chart and concentration.
Which subject and chapter does this question cover?
This is a Class 10 Science question. Chapter: Chemical Substances – Nature and Behaviour. Topic: Acids, Bases, and Salts.
