Acids & Bases — Set 5
Chemistry · अम्ल और क्षार · Questions 41–50 of 60
Which acid is commonly found in apples?
Correct Answer: A. Malic acid
• **Malic acid** = Malic acid is the primary acid responsible for the tart taste of apples. • (Contextual detail from explanation) • 💡 Wrong-option analysis: B: Oxalic acid; C: Formic acid; D: Citric acid
Which of the following is a strong base?
Correct Answer: B. Potassium hydroxide
• **Potassium hydroxide** = Potassium hydroxide is a strong base that completely dissociates into ions in water. • (Contextual detail from explanation) • 💡 Wrong-option analysis: A: Magnesium hydroxide; C: Ammonium hydroxide; D: Copper hydroxide
Which acid is known as 'Oil of Vitriol'?
Correct Answer: D. Sulfuric acid
• **Sulfuric acid** = Sulfuric acid was historically called Oil of Vitriol by ancient alchemists. • (Contextual detail from explanation) • 💡 Wrong-option analysis: A: Hydrochloric acid; B: Phosphoric acid; C: Nitric acid
What is the pH range of gastric juice in the human stomach?
Correct Answer: B. 1.5 - 3.5
• **1.5 - 3.5** = Gastric juice is highly acidic with a pH ranging from 1. • (Contextual detail from explanation) • 💡 Wrong-option analysis: A: 7.0 - 8.0; C: 5.0 - 6.0; D: 9.0 - 10.0
Which acid is present in tea?
Correct Answer: B. Tannic acid
• **Tannic acid** = Tea contains tannic acid, which belongs to a group of compounds called tannins. • (Contextual detail from explanation) • 💡 Wrong-option analysis: A: Citric acid; C: Acetic acid; D: Lactic acid
Which of the following describes a Brønsted-Lowry acid?
Correct Answer: B. Proton donor
• **Proton donor** = According to the Brønsted-Lowry theory, an acid is a substance that can donate a proton (H+). • (Contextual detail from explanation) • 💡 Wrong-option analysis: A: Electron pair donor; C: Hydroxide ion producer; D: Electron pair acceptor
Which acid is used in the manufacture of fertilizers and explosives?
Correct Answer: D. Nitric acid
• **Nitric acid** = Nitric acid is a key industrial chemical used to produce nitrogen-based fertilizers. • (Contextual detail from explanation) • 💡 Wrong-option analysis: A: Boric acid; B: Carbonic acid; C: Tartaric acid
What is the pH value of milk of magnesia?
Correct Answer: D. 10
• **10** = Milk of magnesia is a basic suspension with a pH value of approximately 10. • (Contextual detail from explanation) • 💡 Wrong-option analysis: A: 3; B: 7; C: 1
Which acid is used in the preparation of carbonated soft drinks?
Correct Answer: D. Carbonic acid
• **Carbonic acid** = Carbonic acid is formed when carbon dioxide is dissolved in water under pressure. • **2** — It is a weak and unstable acid that decomposes back into CO2 and water • 💡 Wrong-option analysis: A: Nitric acid; B: Sulfuric acid; C: Hydrochloric acid
Which of the following is a Lewis base?
Correct Answer: C. NH3
• **NH3** = Ammonia (NH3) is a Lewis base because it has a lone pair of electrons to donate. • (Contextual detail from explanation) • 💡 Wrong-option analysis: A: H+; B: BF3; D: AlCl3