Which acid is found in lemons? a. Phosphoric acid b. Carbonic acid c. Citric acid d. Malic acid Ans: c
Which acid gives spinach its acidic character? a. Lactic acid b. Oxalic acid c. Carbonic acid d. Formic acid Ans: b
Which acid causes milk to turn sour? a. Acetic acid b. Citric acid c. Ascorbic acid d. Lactic acid Ans: d
Which acid is used to remove rust and iron stains from clothes? a. Citric acid b. Dilute hydrochloric acid c. Oxalic acid d. Acetic acid Ans: c
Tartaric acid is not present in which of the following? a. Tamarind b. Grapes c. Unripe mangoes d. Spinach Ans: d
Bee stings contain: a. An acidic liquid b. A salt solution c. An alkaline liquid d. A corrosive agent Ans: a
Which acid is responsible for the sour taste in Coca-Cola? a. Acetic acid b. Phosphoric acid c. Hydrochloric acid d. Formic acid Ans: b
Which acid is also known as “Muriatic acid”? a. Hydrochloric acid b. Sulphuric acid c. Carbonic acid d. Nitric acid Ans: a
Which acid is present in tomatoes? a. Oxalic acid b. Citric acid c. Acetic acid d. Malic acid Ans: a
Which acid is found in apples? a. Citric acid b. Acetic acid c. Malic acid d. None of the above Ans: c
2. Common Substances & Chemical Names
What is the common name of sodium carbonate? a. Limestone b. Lime c. Marble d. Washing soda Ans: d
What is the common name of CaOCl₂? a. Baking soda b. Bleaching powder c. Baking powder d. Washing soda Ans: b
Sodium bicarbonate is also known as: a. Baking soda b. Washing powder c. Plaster d. Fly ash Ans: a
What is brine solution? a. Excess salt in water b. Silver in water c. Excess ethanol in water d. Excess starch in water Ans: a
Which substance turns black when concentrated sulphuric acid is added? a. Vinegar b. Sugar c. Salt d. Alcohol Ans: b
3. Reactions & Uses
Which acid is used to dissolve noble metals like gold and platinum? a. Nitric acid b. Hydrochloric acid c. Sulphuric acid d. Aqua regia Ans: d
Which acid does not release CO₂ from sodium bicarbonate? a. Sulphuric acid b. Formic acid c. Carbonic acid d. Acetic acid Ans: a
Which acid is used in making aspirin? a. Acetic acid b. Salicylic acid c. Oxalic acid d. Succinic acid Ans: b
Which ester is used medicinally (e.g., in pain balms)? a. Ethyl acetate b. Methyl acetate c. Methyl salicylate d. Ethyl benzoate Ans: c
4. Indicators, pH & Acidity
The pH of lemon juice is expected to be: a. More than 7 b. Less than 7 c. Equal to 7 d. Cannot be predicted Ans: b
The pH range of human blood is: a. 8.25 – 8.35 b. 7.35 – 7.45 c. 6.45 – 6.55 d. 4.0 – 4.5 Ans: b
The color of nitric acid is due to the presence of: a. Carbon dioxide b. Sulphur dioxide c. Colored impurities d. Nitrogen dioxide Ans: d
5. Matching & Sources
Match the substance with its nature:
A. Acidic – 2. Carbonated drink
B. Basic – 3. Soap
C. Neutral – 1. Distilled water Ans: b
Match the acid with its natural source:
A. Formic acid – 3. Ants
B. Citric acid – 1. Lemon
C. Tartaric acid – 2. Tamarind Ans: b
6. Elements, Oxides, and Miscellaneous
Which of the following is a pure element? a. Glass b. Cement c. Sodium d. Steel Ans: c
Which acid does NOT react with gold? a. Nitric acid b. Copper c. Zinc d. Iron Ans: a
Sodium carbonate is a basic salt because it is derived from: a. Weak acid and weak base b. Strong acid and strong base c. Weak acid and strong base d. Strong acid and weak base Ans: c
Kidney stones are primarily made of: a. Calcium oxalate b. Sodium chloride c. Magnesium nitrate d. Calcium bicarbonate Ans: a
Which of the following is NOT a base? a. Ba(OH)₂ b. Sr(OH)₂ c. B(OH)₃ d. Ca(OH)₂ Ans: c
Who invented soda water? a. Tivadar Puskás b. Joseph Priestley c. Petrache Poenaru d. James L. Plimpton Ans: b
7. Bases & Indicators
Which base is used as an antacid? a. Calcium hydroxide b. Barium hydroxide c. Magnesium hydroxide d. Silver hydroxide Ans: c
Which of the following are natural indicators? a. Phenolphthalein b. Litmus c. Methyl orange d. All of the above Ans: d
Litmus is obtained from: a. Bacteria b. Fungus c. Alga d. Lichen Ans: d
Aluminium oxide is: a. Basic oxide b. Neutral oxide c. Amphoteric oxide d. Acidic oxide Ans: c