Everyday life chemistry

Everyday Life Chemistry – 15 Interactive MCQs with Answers

Test your knowledge of chemistry in daily life with these interactive questions. Click an option to see the correct answer and explanation instantly.

1. Which gas is commonly used in soft drink bottles?

Answer: b) Carbon dioxide
Explanation: CO₂ is used to carbonate drinks, giving them fizz and preventing spoilage.

2. Which chemical is used for bleaching clothes?

Answer: b) Calcium hypochlorite
Explanation: Commonly known as bleaching powder, it is used to whiten clothes and disinfect water.

3. Which acid is present in lemon?

Answer: b) Citric acid
Explanation: Citric acid gives lemon its sour taste and acts as a natural preservative.

4. Which gas is used in fire extinguishers?

Answer: c) Carbon dioxide
Explanation: CO₂ displaces oxygen and cools the fire, helping to extinguish it.

5. Which element is used in thermometers?

Answer: a) Mercury
Explanation: Mercury remains liquid over a wide temperature range, making it ideal for thermometers.

6. Which chemical is added to toothpaste to prevent tooth decay?

Answer: b) Sodium fluoride
Explanation: Sodium fluoride strengthens tooth enamel and prevents cavities.

7. Which gas is known as laughing gas?

Answer: b) Nitrous oxide
Explanation: N₂O has a mild anesthetic effect and can induce laughter when inhaled.

8. Which acid is found in milk?

Answer: a) Lactic acid
Explanation: Lactic acid forms when milk sours due to bacterial fermentation of lactose.

9. Which gas turns lime water milky?

Answer: b) Carbon dioxide
Explanation: CO₂ reacts with calcium hydroxide in lime water to form insoluble calcium carbonate, making it milky.

10. Which metal is used for making aircraft bodies?

Answer: c) Aluminium
Explanation: Aluminium is lightweight, strong, and resistant to corrosion, ideal for aircraft construction.

11. Which acid is present in vinegar?

Answer: b) Acetic acid
Explanation: Acetic acid gives vinegar its sour taste and strong smell.

12. Which gas is filled in balloons to make them float?

Answer: a) Helium
Explanation: Helium is lighter than air, non-flammable, and safe for balloons.

13. Which gas is essential for breathing?

Answer: b) Oxygen
Explanation: Oxygen is vital for cellular respiration in humans and animals.

14. Which chemical is used in table salt to prevent goiter?

Answer: c) Iodine
Explanation: Iodized salt helps prevent iodine deficiency and goiter.

15. Which gas is used for ripening fruits artificially?

Answer: a) Ethylene
Explanation: Ethylene is a natural plant hormone used for controlled fruit ripening.

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