Why is it scientifically wrong to judge an unknown solution as acid or base only by its colour?
Answer and explanation
Correct answer: Many acids and bases can be colourless
The governing idea is that colour alone is not a reliable chemical test. Many acids and bases, such as dilute hydrochloric acid and sodium hydroxide solution, are colourless, while the colour of a substance may come from another dissolved chemical. An indicator, universal indicator, or pH paper should be used because its colour change is linked to acidity or basicity. Therefore option A is correct.
Frequently asked questions
What is the correct answer to this question?
Many acids and bases can be colourless
Why is this the correct answer?
The governing idea is that colour alone is not a reliable chemical test. Many acids and bases, such as dilute hydrochloric acid and sodium hydroxide solution, are colourless, while the colour of a substance may come from another dissolved chemical. An indicator, universal indicator, or pH paper should be used because its colour change is linked to acidity or basicity. Therefore option A is correct.
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.
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