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extra questions from
Chapter 5, specifically
Very Short Answer Type questions related to
acids, bases, and litmus paper tests.
Here’s a clear explanation of the two questions and their answers:
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Question 1:
What is the test for acids and bases using litmus paper?
Answer:
Acids turn blue litmus paper red, while bases turn red litmus paper blue.
Explanation:
Litmus paper is a common indicator used to determine whether a substance is acidic or basic:
-
Blue litmus paper turns
red in the presence of an
acid.
-
Red litmus paper turns
blue in the presence of a
base.
This color change happens because litmus is a natural dye that responds to the hydrogen ion (H⁺) concentration in a solution.
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Question 2:
What name is given to those substances which do not change the colour of either red or blue litmus paper?
Answer:
The solutions or substances which do not change the colour of either red or blue litmus paper are called
neutral substances.
Explanation:
Substances that are
neither acidic nor basic are said to be
neutral. They do not affect the color of litmus paper:
- A neutral solution (like pure water) will leave both red and blue litmus papers unchanged.
- This indicates a pH around
7, which is neutral on the pH scale.
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✔ Summary:
-
Acidic → Blue litmus → Red
-
Basic → Red litmus → Blue
-
Neutral → No color change
Let me know if you'd like diagrams, examples, or more practice questions!
Parent Tip: Review the logic above to help your child master the concept of acids bases and salts answer.
