1. The chemical formula of ethanol is
Answer: D. C₂H₅OH
Chemistry Class 10 Unit 10: Hydroxy Compounds MCQs
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2. The chemical formula of methanol is
Answer: A. CH₃OH
3. Ethanol can be manufactured by
Answer: C. fermentation of glucose and hydration of ethene
4. Which organism is used in the fermentation process to produce ethanol?
Answer: B. Yeast
5. The optimum temperature range for fermentation of glucose is
Answer: A. 25–35 °C
6. The equation for fermentation of glucose is
Answer: C. C₆H₁₂O₆ → 2C₂H₅OH + 2CO₂
7. The primary by-product of ethanol fermentation is
Answer: B. carbon dioxide
8. Fractional distillation of the fermentation mixture gives
Answer: D. 96 % ethanol (rectified spirit)
9. 96 % pure ethanol is called
Answer: C. rectified spirit
10. Rectified spirit is converted into 100 % ethanol using a dehydrating agent such as
Answer: D. concentrated H₂SO₄
11. Ethanol is also made industrially by the catalytic addition of steam to
Answer: A. ethene
12. In the hydration of ethene, the temperature is about
Answer: B. 300 °C
13. In the hydration of ethene, the pressure is about
Answer: C. 6 atm (6000 kPa)
14. The catalyst used in the catalytic hydration of ethene is
Answer: D. phosphoric acid
15. In the hydration of ethene, only about ______ of ethene is converted into ethanol per pass.
Answer: A. 4 %
16. A disadvantage of the hydration method is that it
Answer: B. uses non-renewable ethene and high energy
17. A disadvantage of fermentation is that it is
Answer: B. a slow batch process producing impure ethanol
18. An advantage of fermentation is that it
Answer: A. uses renewable resources and low energy
19. The combustion of ethanol is represented by
Answer: D. C₂H₅OH + 3O₂ → 2CO₂ + 3H₂O + heat
20. Methanol as a car fuel has
Answer: C. a lower energy content than gasoline
21. Petrol blended with 10–20 % ethanol is called
Answer: A. gasohol
22. Ethanol is a better fuel in terms of the environment because it is
Answer: C. renewable and cleaner burning
23. Which fuel is commonly blended with petrol to reduce emissions?
Answer: B. Ethanol
24. One advantage of alcohol fuels over fossil fuels is that they
Answer: D. are renewable
25. A disadvantage of alcohol fuels compared to petrol is
Answer: C. lower energy content
26. Vinegar is produced by the bacterial oxidation of
Answer: B. ethanol
27. Bacterial oxidation of ethanol to ethanoic acid needs
Answer: D. the presence of oxygen
About Chemistry Class 10 Unit 10 MCQs (Federal Board)
These 27 Chemistry MCQs cover Class 10 Unit 10: Hydroxy Compounds of the Federal Board (FBISE) SSC-II (Class 10) syllabus. They are SLO-based MCQs as per the new pattern for FBISE exams. Each question has four options and the correct answer is shown, so you can practise for the annual examination and find the topics you still need to revise. You can also read the Hydroxy Compounds notes for this chapter. Download the Hydroxy Compounds MCQs as a PDF using the button at the top of this page.