Ethanol is produced by fermentation of sugar. The microorganisms used are:
A. Algae
B. Bacteria
C. Virus
D. Yeast
Answer: Option D
Solution (By JKSSB Mock Tests)
Yeast (Saccharomyces cerevisiae) enzymes convert glucose to ethanol and CO₂ anaerobically. Bacteria produce lactic acid or acetic acid; algae are photosynthetic.
Explanation:
The number of half-lives elapsed is 30 days / 10 days = 3. The fraction remaining is (1/2)ⁿ, where n is the number of half-lives. So, (1/2)³ = 1/8. After 10 days: 1/2; after 20 days: 1/4; after 30 days: 1/8 of the original amount remains.
Explanation:
Red litmus turning blue indicates that the solution is basic. Basic solutions have a pH greater than 7. Among the options, 10 is the only value greater than 7. pH 1 and 4 are acidic (turn blue litmus red), and 7 is neutral (no change in litmus color).
Explanation:
A Lewis acid is a chemical species that can accept a pair of electrons to form a covalent bond. BF3 has an incomplete octet on the boron atom (only 6 electrons), making it an electron-deficient molecule and a strong Lewis acid. NH3, H2O, and OH- have lone pairs and act as Lewis bases.
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