Which enzyme converts glucose into ethanol? MCQ with Answer and Explanation

Which enzyme converts glucose into ethanol?
A. Urease
B. Maltase
C. Invertase
D. Zymase
Answer: Option D
Solution (By JKSSB Mock Tests)
Zymase, a complex of enzymes from yeast, catalyzes fermentation: C₆H₁₂O₆ → 2C₂H₅OH + 2CO₂. Invertase hydrolyzes sucrose; urease hydrolyzes urea; maltase converts maltose to glucose.

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Practice More chemistry Questions

Question #1
Caustic soda is produced along with chlorine and hydrogen by electrolysis of:
A. HCl
B. Brine (concentrated NaCl solution)
C. Molten NaCl
D. NaOH solution

Correct Answer: Option B


Explanation:
Chlor-alkali process: electrolysis of brine gives NaOH (at cathode), Cl₂ (at anode), and H₂ (at cathode). Molten NaCl gives Na and Cl₂, not NaOH.

This question belongs to: Science chemistry
Question #2
The process in which a heavy nucleus splits into two lighter nuclei with the release of enormous energy is called:
A. Nuclear fusion
B. Nuclear fission
C. Transmutation
D. Radioactive decay

Correct Answer: Option B


Explanation:
Nuclear fission is a reaction in which the nucleus of a heavy atom (like Uranium-235 or Plutonium-239) splits into two or smaller, lighter nuclei when bombarded by a neutron, releasing a massive amount of energy and more neutrons, potentially causing a chain reaction.

This question belongs to: Science chemistry
Question #3
The reaction N₂ + 3H₂ → 2NH₃ is an example of:
A. Displacement reaction
B. Combination reaction
C. Decomposition reaction
D. Double displacement reaction

Correct Answer: Option B


Explanation:
Two or more substances combine to form a single product: N₂ + 3H₂ → 2NH₃. This is a combination (synthesis) reaction. Decomposition involves a single compound breaking down. Displacement: one element displaces another. Double displacement: exchange of ions. The Haber process for ammonia is also a redox and reversible reaction. Combination can be exothermic.

This question belongs to: Science chemistry