Chemistry
The pH of the soil is tested, and for the better growth of crops, slightly alkaline soil is required. Which ion in the fertiliser will increase the alkalinity of the soil?
- Hydronium ion
- Hydroxyl ion
- Hydrogen ion
- Both hydroxyl and hydrogen
Acids Bases Salts
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Answer
Hydroxyl ion
Reason — To increase the alkalinity (i.e., raise the pH) of the soil, we need to reduce acidity and introduce basicity. Basic (alkaline) substances increase OH- (hydroxyl ions). Hydroxyl ions neutralize H+ in the soil and raise the pH, making it more alkaline.
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