What effect does a basic solution have on red litmus paper?
Answer and explanation
Correct answer: Turns it blue
Red litmus paper is an indicator used to test for basicity. When placed in a basic or alkaline solution, it changes from red to blue because the indicator has a different colour in an alkaline medium. Keeping it red would not show the characteristic basic response, and yellow or black are not the standard litmus colours for this test. Therefore option B correctly describes the observation and identifies the solution as basic.
Frequently asked questions
What is the correct answer to this question?
Turns it blue
Why is this the correct answer?
Red litmus paper is an indicator used to test for basicity. When placed in a basic or alkaline solution, it changes from red to blue because the indicator has a different colour in an alkaline medium. Keeping it red would not show the characteristic basic response, and yellow or black are not the standard litmus colours for this test. Therefore option B correctly describes the observation and identifies the solution as basic.
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.
