Here are 10 One-Word Answer Type Questions from the topic Natural Indicators Around Us (from your provided PDF), with answers and explanations after each question as requested:
One-Word Answer Type Questions
Topic: Natural Indicators Around Us
1. Question: Name a natural indicator obtained from lichens.
• Answer: Litmus
• Explanation: Litmus is a natural indicator prepared from lichens that changes colour in acids and bases.
2. Question: What colour does blue litmus turn in an acid?
• Answer: Red
• Explanation: Blue litmus changes to red in the presence of an acid.
3. Question: What colour does red litmus turn in a base?
• Answer: Blue
• Explanation: Red litmus changes to blue when dipped in a basic solution.
4. Question: Name the natural indicator found in turmeric.
• Answer: Turmeric
• Explanation: Turmeric is a natural indicator that changes colour in basic substances.
5. Question: What colour does turmeric turn in a base?
• Answer: Red
• Explanation: Turmeric turns red in the presence of a base.
6. Question: What colour is turmeric in an acidic solution?
• Answer: Yellow
• Explanation: Turmeric remains yellow in an acidic medium.
7. Question: Name the flower extract used as a natural indicator.
• Answer: China rose
• Explanation: China rose petals’ solution is a natural indicator.
8. Question: What colour does China rose indicator give in acid?
• Answer: Dark pink
• Explanation: China rose indicator turns dark pink in an acidic solution.
9. Question: What colour does China rose indicator give in base?
• Answer: Green
• Explanation: China rose indicator turns green in a basic solution.
10. Question: What is the common use of natural indicators?
• Answer: Testing
• Explanation: Natural indicators are used for testing whether a substance is acidic or basic.
If you want, I can now prepare the next set from the topic Neutralisation in the same format.
Shall I continue?
