MCQs-Chapter 2- Exploring Substances: Acidic, Basic, and Neutral

 Multiple Choice Questions Chapter 2- Exploring Substances: Acidic, Basic, and Neutral Subject Science

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1. What does blue litmus paper turn into when it touches an acid?
A. Green
B. Yellow
C. Red
D. No change
✅ Answer: C. Red

2. Which of the following is a base?
A. Lemon juice
B. Vinegar
C. Soap solution
D. Tamarind water
✅ Answer: C. Soap solution

3. What is the colour of red litmus paper in a basic solution?
A. Red
B. Yellow
C. Blue
D. Green
✅ Answer: C. Blue

4. Which natural indicator is made from lichens?
A. Turmeric
B. Litmus
C. Rose extract
D. Onion
✅ Answer: B. Litmus

5. What colour does turmeric paper turn in a basic solution?
A. Yellow
B. Red-brown
C. Blue
D. Green
✅ Answer: B. Red-brown

6. What is the nature of vinegar?
A. Basic
B. Neutral
C. Acidic
D. Salty
✅ Answer: C. Acidic

7. Which sample is neutral in nature?
A. Lemon juice
B. Vinegar
C. Tap water
D. Soap solution
✅ Answer: C. Tap water

8. Which substance does not change the colour of litmus paper?
A. Salt solution
B. Vinegar
C. Soap solution
D. Baking soda
✅ Answer: A. Salt solution

9. What happens when an acid and a base mix in correct amounts?
A. Explosion
B. Turns black
C. Neutralisation
D. Melts
✅ Answer: C. Neutralisation

10. What are the products of neutralisation?
A. Acid + Fire
B. Salt + Water + Heat
C. Only water
D. Base + Cold
✅ Answer: B. Salt + Water + Heat

11. What should be applied on an ant bite?
A. Vinegar
B. Baking soda
C. Turmeric
D. Salt
✅ Answer: B. Baking soda

12. What is used to treat acidic soil?
A. Lemon juice
B. Vinegar
C. Lime (base)
D. Water
✅ Answer: C. Lime (base)

13. What does red rose extract turn in acidic solutions?
A. Green
B. Red
C. Yellow
D. Blue
✅ Answer: B. Red

14. Which indicator is good for detecting basic substances only?
A. Turmeric
B. Litmus
C. Onion
D. Red rose
✅ Answer: A. Turmeric

15. What is the taste of most acids?
A. Sweet
B. Bitter
C. Salty
D. Sour
✅ Answer: D. Sour

16. Which of these is a natural indicator?
A. Soap
B. Salt
C. Turmeric
D. Water
✅ Answer: C. Turmeric

17. What happens when you add lime water to lemon juice?
A. Turns blue
B. Turns red
C. Turns green
D. No change
✅ Answer: A. Turns blue

18. Why did the message appear on Ashwin’s greeting card?
A. He used magic ink
B. Turmeric and soap created a chemical change
C. It was printed
D. It glowed in the dark
✅ Answer: B. Turmeric and soap created a chemical change

19. Which flower helps detect acids and bases?
A. Rose
B. Lily
C. Sunflower
D. Jasmine
✅ Answer: A. Rose

20. What kind of reaction produces heat?
A. Melting
B. Neutralisation
C. Freezing
D. Boiling
✅ Answer: B. Neutralisation

21. What does baking soda feel like?
A. Sticky
B. Wet
C. Slippery
D. Rough
✅ Answer: C. Slippery

22. Which indicator changes its smell in acids and bases?
A. Litmus
B. Red rose
C. Onion
D. Vinegar
✅ Answer: C. Onion

23. What is the nature of washing powder solution?
A. Acidic
B. Basic
C. Neutral
D. Salty
✅ Answer: B. Basic

24. Which of these contains citric acid?
A. Milk
B. Soap
C. Lemon
D. Baking soda
✅ Answer: C. Lemon

25. What does the hydrangea flower colour depend on?
A. Age
B. Soil nature (acidic/basic)
C. Water
D. Temperature
✅ Answer: B. Soil nature (acidic/basic)

26. What turns turmeric paper red-brown?
A. Acid
B. Neutral substance
C. Base
D. Salt
✅ Answer: C. Base

27. Which one of these is not an acid-base indicator?
A. Turmeric
B. Red rose
C. Salt
D. Litmus
✅ Answer: C. Salt

28. What happens to blue litmus in basic solution?
A. Turns red
B. Turns green
C. No change
D. Turns purple
✅ Answer: C. No change

29. Which acid is present in tamarind?
A. Citric acid
B. Formic acid
C. Tartaric acid
D. Acetic acid
✅ Answer: C. Tartaric acid

30. Why did Aman see bubbles with vinegar on eggshells?
A. Vinegar boiled
B. Reaction with calcium carbonate
C. Soap was added
D. It dried
✅ Answer: B. Reaction with calcium carbonate

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