. What is produced from the fermentation of starch?
a) Ethanol
b) Ethanal
c) Methanal
d) Methanol
Answer: a
2. Bagasse (sugarcane residue) is primarily used in the production of:
a) Paper
b) Plastic
c) Paint
d) Varnish
Answer: a
3. Which gas is used for artificially ripening fruits?
a) Ethyne
b) Ethylene
c) Ethane
d) Methane
Answer: b
4. Formalin is an aqueous solution of:
a) Methanal
b) Ethanol
c) Fructose
d) Nitric acid
Answer: a
5. The temperature of an oxy-acetylene flame is approximately:
a) 2800°C
b) 3200°C
c) 4000°C
d) 1500°C
Answer: c
6. Denatured alcohol is mixed with:
a) Petrol
b) Kerosene
c) Water
d) Pyridine
Answer: d
7. Which compound is a component of tear gas?
a) Ethane
b) Ether
c) Ethanol
d) Chloropicrin
Answer: d
8. The compound with the lowest octane rating is:
a) n-Heptane
b) 2-Methylheptane
c) Iso-octane
d) 2,2-Dimethylhexane
Answer: a
9. Which gas is commonly referred to as “marsh gas”?
a) CO
b) CO₂
c) CH₄
d) H₂
Answer: c
10. Who discovered benzene?
a) Hal Anger
b) Michael Faraday
c) Bruce Ames
d) Nicolas Appert
Answer: b
11. Which compound reacts with Fehling’s solution?
a) HCHO
b) C₂H₅OH
c) CH₃COOH
d) CH₃COCH₃
Answer: a
12. Which gas is used to generate light and weld metals?
a) Ethylene
b) Acetylene
c) Glycol
d) Oxalic acid
Answer: b
13. Which organism is responsible for alcohol fermentation?
a) Chlorella
b) Yeast
c) Agaricus
d) Puccinia
Answer: b
14. Pentane has how many structural isomers?
a) 1
b) 2
c) 3
d) 4
Answer: c
15. Aldehydes function as:
a) Mild oxidizing agents
b) Strong oxidizing agents
c) Strong reducing agents
d) Mild reducing agents
Answer: c
16. Carcinogenic chemicals are known to cause:
a) Heart disease
b) Diabetes
c) Cancer
d) Asthma
Answer: c
17. Which of the following is also known as carbolic acid?
a) Phenol
b) Hydroxide
c) Sulphuric acid
d) Ethanol
Answer: a
18. The chemical formula of urea is:
a) (NH)₂CO₂
b) (NH)CO
c) (NH)₂CO
d) (NH₂)₂CO
Answer: d
19. Ethane gas has a slightly ______ taste.
a) Sweet
b) Bitter
c) Sour
d) Salty
Answer: a
20. Which compound is used in alcoholic beverages, medicines, and as aircraft fuel?
a) Propyl alcohol
b) Dimethyl alcohol
c) Ethyl alcohol
d) Methyl alcohol
Answer: c
21. Chloroform is primarily used as a:
a) Analgesic
b) Anaesthetic
c) Antimalarial
d) Antibiotic
Answer: b
22. Which of the following is a heterocyclic compound?
a) Benzene
b) Anthracene
c) Naphthalene
d) Furan
Answer: d