Short Questions

• Read the main chapter carefully.
• you can see the chapter from NCERT site https://ncert.nic.in/textbook.php?gecu1=1-12 or can download it here

 A. Short questions:

1. Why does your mouth feel a bit dry and bitter after vomiting? What kind of substance is present in the stomach?
A: The stomach contains hydrochloric acid (HCl). Vomiting brings up this acid, causing a bitter, burning sensation in the mouth.

2. Q: Lemon juice and soap water fall on a turmeric-stained cloth. One leaves no mark, the other leaves a red stain. Can you explain why?
A: Turmeric turns red in basic substances, so soap water leaves a red stain. Lemon juice is acidic and does not change turmeric’s color.

3. Q: Why should we never taste a substance to check if it is acidic or basic? Suggest a safer alternative.
A: Some acids and bases can be corrosive and harmful. We should use indicators like litmus paper or turmeric instead.

4. Q: You have baking soda, curd, and sugar syrup in your kitchen. Which one is likely to be basic, and why?
A: Baking soda is a mild base (alkaline). Curd is acidic and sugar syrup is neutral.

 Nature-Inspired Exploration

5. Q: Ant bites cause a burning sensation. How does rubbing soap or baking soda help relieve the pain?
A: Ant bites inject formic acid. Soap/baking soda are basic, which neutralize the acid and reduce the pain.