Chapter 2: Acids, Bases and Salts — Online MCQ Test
SCIENCE · Grade 10 · CBSE(NCERT)
Practice Chapter 2: Acids, Bases and Salts with a free chapter-wise online MCQ test.
This chapter covers: chemistry-2.
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Chapter 2: Acids, Bases and Salts — Important Questions & Answers
What colour does red litmus paper turn in the presence of a base?
- A. Yellow
- B. Green
- C. Blue
- D. Remains red
Answer: C. Blue
Red litmus paper turns blue in the presence of a base, which is a key property used to identify basic solutions.
Red litmus paper turns blue in the presence of a base, which is a key property used to identify basic solutions.
Which gas is liberated when an acid reacts with a metal?
- A. Oxygen
- B. Carbon dioxide
- C. Nitrogen
- D. Hydrogen
Answer: D. Hydrogen
When an acid reacts with a metal, hydrogen gas is liberated along with a salt.
When an acid reacts with a metal, hydrogen gas is liberated along with a salt.
A solution has a pH of 10. Which of the following best describes this solution?
- A. Strongly acidic
- B. Weakly acidic
- C. Neutral
- D. Basic
Answer: D. Basic
A pH of 10 is greater than 7, which indicates a basic solution. It also turns red litmus paper blue.
A pH of 10 is greater than 7, which indicates a basic solution. It also turns red litmus paper blue.
Arrange the following pH values in increasing order of hydrogen ion concentration: 11, 9, 7, 4, 1.
- A. 1 < 4 < 7 < 9 < 11
- B. 11 < 9 < 7 < 4 < 1
- C. 7 < 4 < 1 < 9 < 11
- D. 4 < 1 < 7 < 9 < 11
Answer: B. 11 < 9 < 7 < 4 < 1
pH is inversely related to hydrogen ion concentration. As pH decreases, H+ concentration increases. So order of increasing H+ concentration is pH 11 < 9 < 7 < 4 < 1.
pH is inversely related to hydrogen ion concentration. As pH decreases, H+ concentration increases. So order of increasing H+ concentration is pH 11 < 9 < 7 < 4 < 1.
Which of the following best explains why concentrated sulfuric acid is a strong dehydrating agent while dilute sulfuric acid is not?
- A. Concentration determines acid strength, not dehydrating ability
- B. Concentrated H2SO4 has high affinity for water and removes it from substances, while dilute form is diluted with water
- C. Dilute H2SO4 is a weak acid and cannot remove water
- D. Only concentrated acids show exothermic reactions with water
Answer: B. Concentrated H2SO4 has high affinity for water and removes it from substances, while dilute form is diluted with water
Concentrated H2SO4 absorbs water strongly due to high affinity; addition to water is highly exothermic. Dilute H2SO4 already contains water, so it cannot dehydrate.
Concentrated H2SO4 absorbs water strongly due to high affinity; addition to water is highly exothermic. Dilute H2SO4 already contains water, so it cannot dehydrate.