Ethanol is chemically: MCQ with Answer and Explanation

Ethanol is chemically:
A. C₂H₅OH
B. CH₃OH
C. C₂H₅COOH
D. CH₃COOH
Answer: Option A
Solution (By JKSSB Mock Tests)
Ethanol, commonly known as ethyl alcohol, has the chemical formula C₂H₅OH. Methanol is CH₃OH. Acetic acid (ethanoic acid) is CH₃COOH, and propionic acid is C₂H₅COOH. Ethanol is widely used as a solvent, in alcoholic beverages, and as a biofuel.

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Practice More chemistry Questions

Question #1
The Ostwald process is used for the manufacture of:
A. Sodium carbonate
B. Sulphuric acid
C. Nitric acid
D. Ammonia

Correct Answer: Option C


Explanation:
The Ostwald process is the industrial method for manufacturing nitric acid (HNO₃). It involves the catalytic oxidation of ammonia (NH₃) to nitric oxide (NO), which is then further oxidized to nitrogen dioxide (NO₂) and absorbed in water to form concentrated nitric acid.

This question belongs to: Science chemistry
Question #2
Nitric acid reacts with copper to produce:
A. Nitrogen dioxide and copper nitrate
B. Oxygen
C. Nitrogen and water
D. Hydrogen

Correct Answer: Option A


Explanation:
Cu + 4HNO₃ (conc.) → Cu(NO₃)₂ + 2NO₂ + 2H₂O. Dilute HNO₃ gives NO instead of NO₂. Copper does not produce H₂ with HNO₃ because HNO₃ is an oxidizing acid.

This question belongs to: Science chemistry
Question #3
Which bacterium is responsible for converting ammonia into nitrites in the nitrogen cycle?
A. Rhizobium
B. Azotobacter
C. Nitrosomonas
D. Nitrobacter

Correct Answer: Option C


Explanation:
Nitrification is a two-step aerobic process in the nitrogen cycle. First, ammonia (NH3) is oxidized to nitrites (NO2-) by bacteria like Nitrosomonas and Nitrosococcus. In the second step, nitrites are oxidized to nitrates (NO3-) by Nitrobacter. Rhizobium fixes nitrogen, and Azotobacter is a free-living nitrogen fixer.

This question belongs to: Science chemistry