Acids & Bases — Set 3
Chemistry · अम्ल और क्षार · Questions 21–30 of 60
Which acid is used in lead storage batteries?
Correct Answer: B. Sulfuric acid
• **Sulfuric acid** = Sulfuric acid acts as the electrolyte in lead-acid batteries used in cars and inverters. • (Contextual detail from explanation) • 💡 Wrong-option analysis: A: Hydrochloric acid; C: Acetic acid; D: Nitric acid
What is the pH of human blood?
Correct Answer: D. 7.35 - 7.45
• **7.35 - 7.45** = Human blood is slightly basic and its pH is strictly maintained between 7. • (Contextual detail from explanation) • 💡 Wrong-option analysis: A: 6.5 - 6.8; B: 8.2 - 8.5; C: 5.5 - 6.0
Which of the following is a weak base?
Correct Answer: B. Ammonium hydroxide
• **Ammonium hydroxide** = Ammonium hydroxide is a weak base because it does not ionize completely in water. • (Contextual detail from explanation) • 💡 Wrong-option analysis: A: Potassium hydroxide; C: Sodium hydroxide; D: Lithium hydroxide
What color does methyl orange turn in an acidic solution?
Correct Answer: A. Red
• **Red** = Methyl orange is a synthetic indicator that turns red in acidic environments. • (Contextual detail from explanation) • 💡 Wrong-option analysis: B: Blue; C: Yellow; D: Green
Which of the following acids is also known as Vitamin C?
Correct Answer: D. Ascorbic acid
• **Ascorbic acid** = Ascorbic acid is the chemical name for Vitamin C, an essential nutrient for humans. • (Contextual detail from explanation) • 💡 Wrong-option analysis: A: Aspartic acid; B: Acetic acid; C: Amino acid
Which chemical is used to neutralize soil that is too acidic?
Correct Answer: A. Quick lime
• **Quick lime** = Quick lime (calcium oxide) is a basic substance used by farmers to neutralize acidic soil. • (Contextual detail from explanation) • 💡 Wrong-option analysis: B: Hydrochloric acid; C: Sodium chloride; D: Vinegar
Which acid is used for cleaning gold and silver ornaments?
Correct Answer: A. Nitric acid
• **Nitric acid** = Nitric acid is used in the form of Aqua Regia or alone to clean and refine precious metals. • (Contextual detail from explanation) • 💡 Wrong-option analysis: B: Lactic acid; C: Boric acid; D: Carbonic acid
What is the scale used to express the acidity or alkalinity of a substance?
Correct Answer: A. pH scale
• **pH scale** = The pH scale measures the concentration of hydrogen ions in a solution. • **1909** — Sørensen in 1909 • 💡 Wrong-option analysis: B: Kelvin scale; C: Richter scale; D: Beaufort scale
Which of the following is a natural indicator?
Correct Answer: B. Red cabbage juice
• **Red cabbage juice** = Red cabbage juice contains anthocyanins that change color based on the acidity of the solution. • (Contextual detail from explanation) • 💡 Wrong-option analysis: A: Phenolphthalein; C: Methyl orange; D: Bromothymol blue
Which acid is found in curd and sour milk?
Correct Answer: A. Lactic acid
• **Lactic acid** = Lactic acid is produced when bacteria ferment the lactose sugar present in milk. • (Contextual detail from explanation) • 💡 Wrong-option analysis: B: Butyric acid; C: Malic acid; D: Citric acid