Acids & Bases — Set 6

Correct Answer: D. Oxalic acid

• **Oxalic acid** = Tomatoes contain oxalic acid along with smaller amounts of citric and malic acids. • (Contextual detail from explanation) • 💡 Wrong-option analysis: A: Citric acid; B: Formic acid; C: Acetic acid

Correct Answer: B. Aqua Regia

• **Aqua Regia** = Aqua Regia, or 'Royal Water', is a powerful mixture that can dissolve noble metals like gold. • (Contextual detail from explanation) • 💡 Wrong-option analysis: A: Lunar caustic; C: Brine; D: Vitriol

Correct Answer: B. Lime water

• **Lime water** = Lime water is a solution of calcium hydroxide that reacts with CO2 to form insoluble calcium carbonate. • (Contextual detail from explanation) • 💡 Wrong-option analysis: A: Baking soda; C: Spirit of salt; D: Caustic soda

Correct Answer: C. Hydrochloric acid

• **Hydrochloric acid** = Hydrochloric acid was traditionally called spirit of salt because it was produced from common salt. • (Contextual detail from explanation) • 💡 Wrong-option analysis: A: Phosphoric acid; B: Sulfuric acid; D: Nitric acid

Correct Answer: B. Bromothymol blue

• **Bromothymol blue** = Bromothymol blue is a chemical indicator used for measuring substances near neutral pH. • (Contextual detail from explanation) • 💡 Wrong-option analysis: A: Phenolphthalein; C: Litmus; D: Methyl orange

Correct Answer: D. Aluminum hydroxide

• **Aluminum hydroxide** = Aluminum hydroxide is a common active ingredient in antacid liquids and tablets. • (Contextual detail from explanation) • 💡 Wrong-option analysis: A: Potassium hydroxide; B: Sodium hydroxide; C: Calcium oxide

Correct Answer: B. Less than 5.6

• **Less than 5.6** = The correct answer is 'Less than 5. • (Contextual detail from explanation) • 💡 Wrong-option analysis: A: Exactly 6.5; C: 8.5; D: 7.0

Correct Answer: A. Hydrochloric acid

• **Hydrochloric acid** = Hydrochloric acid is used in the pickling process to remove rust or scale from iron or steel surfaces. • (Contextual detail from explanation) • 💡 Wrong-option analysis: B: Tartaric acid; C: Citric acid; D: Carbonic acid

Correct Answer: A. Calcium hydroxide

• **Calcium hydroxide** = Calcium hydroxide (dry slaked lime) reacts with chlorine gas to produce bleaching powder. • (Contextual detail from explanation) • 💡 Wrong-option analysis: B: Sodium hydroxide; C: Ammonium hydroxide; D: Magnesium hydroxide

Correct Answer: A. Butyric acid

• **Butyric acid** = Butyric acid is responsible for the unpleasant smell and taste associated with rancid butter. • (Contextual detail from explanation) • 💡 Wrong-option analysis: B: Acetic acid; C: Oxalic acid; D: Lactic acid