6 December 2025 – Everyday Chemistry Quiz
Acids, bases, salts & chemistry in daily life | 10 MCQs | Answers and explanations at the bottom.
1. Which of the following is a common acid found in lemon juice?
2. Which indicator turns pink in a basic (alkaline) solution?
3. In the stomach, excess hydrochloric acid causing acidity is usually treated by:
4. Which of the following is a basic substance commonly used in household cleaning powders?
5. When an acid reacts with a base, which two main products are formed?
6. Which of the following is an example of a neutralisation reaction in daily life?
7. Which salt is used for preventing iodine deficiency and goitre?
8. Toothpastes are generally slightly basic because:
9. Which of the following pairs correctly matches an acid and its common source?
10. A solution has pH = 2. How will you describe it?
Answer Key – Everyday Chemistry Quiz
| Q. No. | Correct Answer | Explanation (Everyday Life Connection) |
|---|---|---|
| 1 | Citric acid | Lemon juice contains citric acid, a weak organic acid that gives the sour taste and is commonly used in food and as a natural cleaner. [web:65][web:67] |
| 2 | Phenolphthalein | Phenolphthalein is colourless in acidic solutions but turns pink in basic (alkaline) solutions, so it is often used in laboratories to detect bases. [web:65][web:69] |
| 3 | Taking an antacid tablet | Antacids contain mild bases like magnesium hydroxide or sodium bicarbonate that neutralise excess hydrochloric acid in the stomach and reduce acidity. [web:68][web:72] |
| 4 | Sodium bicarbonate (baking soda) | Baking soda is a mild base used in some cleaning powders and pastes to remove stains and neutralise odours in kitchens and bathrooms. [web:67][web:72] |
| 5 | Salt and water | When an acid reacts with a base, a neutralisation reaction forms a salt and water; for example, hydrochloric acid and sodium hydroxide form sodium chloride and water. [web:65][web:75] |
| 6 | Mixing lemon juice with baking soda to clean a stain | Lemon juice (acidic) and baking soda (basic) react to neutralise each other and release gas, helping to lift certain stains and clean surfaces. [web:67][web:71] |
| 7 | Iodised salt | Iodised salt has iodine added to ordinary salt to prevent iodine deficiency, which can cause goitre and other thyroid-related problems. [web:69][web:72] |
| 8 | They neutralise acids produced by bacteria in the mouth | Bacteria in the mouth produce acids that attack tooth enamel; slightly basic toothpaste helps neutralise these acids and protect teeth from decay. [web:68][web:71] |
| 9 | Acetic acid – vinegar | Vinegar is a dilute solution of acetic acid, used in cooking, pickling and cleaning; its sour taste comes from acetic acid. [web:66][web:71] |
| 10 | Strongly acidic | The pH scale runs from 0 to 14; solutions with pH less than 7 are acidic. A pH of 2 means the solution is strongly acidic, similar to gastric juice in the stomach. [web:65][web:69] |
Try to answer all questions on your own first. Then open the answer key to check and learn from the explanations.
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