The pH of normal rainwater is slightly acidic, around:
A. 8.0
B. 7.0
C. 5.6
D. 4.5
Answer: Option C
Solution (By JKSSB Mock Tests)
Normal rainwater is slightly acidic with a pH of about 5.6. This is due to the natural dissolution of carbon dioxide from the air into the rain droplets, forming weak carbonic acid (CO₂ + H₂O ⇌ H₂CO₃). Acid rain has a pH lower than 5.6 due to pollutants.
Explanation:
Pepsin is a protease secreted in the stomach; it hydrolyzes proteins into peptides. Ptyalin (salivary amylase) digests starch; amylase also breaks starch; lipase digests fats.
Explanation:
A galvanic (or voltaic) cell generates electrical energy from a spontaneous chemical reaction. The Daniel cell is a specific, classic type of galvanic cell using zinc and copper electrodes. An electrolytic cell does the reverse, using electrical energy to drive a non-spontaneous chemical reaction.
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