Class 10 Science MCQs on Acids, Bases and Salts

Class 10 Science MCQs on Acids, Bases and Salts

 

Class 10 Science MCQs on Acids, Bases and Salts with Answers for the students to prepare for their exams.

 

1. What is the taste of acids?

(a) Sweet
(b) Bitter
(c) Sour
(d) Salty
Answer: (c) Sour

 

2. What happens when an acid touches blue litmus paper?

(a) No change
(b) Turns red
(c) Turns green
(d) Turns yellow
Answer: (b) Turns red

 

3. What happens when a base touches red litmus paper?

(a) No change
(b) Turns blue
(c) Turns redder
(d) Turns white
Answer: (b) Turns blue

 

4. Which of these is a natural indicator?

(a) Vinegar
(b) Baking soda
(c) Turmeric
(d) Salt
Answer: (c) Turmeric

 

5. Which of these is a synthetic indicator?

(a) Onion
(b) Phenolphthalein
(c) Clove oil
(d) Lemon juice
Answer: (b) Phenolphthalein

 

6. What gas is released when acid reacts with metal?

(a) Oxygen
(b) Carbon dioxide
(c) Hydrogen
(d) Nitrogen
Answer: (c) Hydrogen

 

7. What do acids give in water?

(a) OH– ions
(b) H+ ions
(c) Cl– ions
(d) Na+ ions
Answer: (b) H+ ions

 

8. What do bases give in water?

(a) H+ ions
(b) OH– ions
(c) CO2 gas
(d) NaCl
Answer: (b) OH– ions

 

9. Which of these is an olfactory indicator?

(a) Vanilla
(b) Litmus
(c) Methyl orange
(d) Copper
Answer: (a) Vanilla

 

10. Which of these changes colour in basic soap when curry falls on cloth?

(a) Phenolphthalein
(b) Turmeric
(c) Vinegar
(d) Onion juice
Answer: (b) Turmeric

 

11. Neutralisation reaction gives:

(a) Only salt
(b) Water only
(c) Salt and water
(d) Hydrogen gas
Answer: (c) Salt and water

 

12. What is the pH of pure water?

(a) 0
(b) 7
(c) 14
(d) 1
Answer: (b) 7

 

13. A substance with pH = 3 is:

(a) Strong base
(b) Weak acid
(c) Strong acid
(d) Neutral
Answer: (c) Strong acid

 

14. Which indicator is purple in neutral solution?

(a) Turmeric
(b) Litmus
(c) Phenolphthalein
(d) Methyl orange
Answer: (b) Litmus

 

15. Tooth decay starts if pH in mouth is:

(a) 7
(b) More than 7
(c) Less than 5.5
(d) 9
Answer: (c) Less than 5.5

 

16. Which base is used in antacids?

(a) Sodium chloride
(b) Magnesium hydroxide
(c) Sulphuric acid
(d) Potassium hydroxide
Answer: (b) Magnesium hydroxide

 

17. What is the colour of phenolphthalein in base?

(a) Pink
(b) Yellow
(c) Colourless
(d) Red
Answer: (a) Pink

 

18. What is baking soda chemically?