The soil having pH less than 6.5 is called _______.
Acidic
The correct answer is Option 1: Acidic.
Understanding Soil pH Levels
The pH scale measures how acidic or basic (alkaline) a substance is, ranging from 0 to 14. A pH value of 7.0 is considered completely neutral.
When it comes to agricultural and environmental science, soil classification is strictly based on this scale:
Acidic Soil (pH < 6.5): Soil with a pH below 6.5 is classified as acidic. The lower the pH number, the more intense the acidity. Strongly acidic soils (pH below 5.5) can restrict plant growth because essential nutrients like phosphorus become locked up, while toxic elements like aluminum become more soluble.
Neutral Soil (pH 6.5 to 7.3): Most agricultural crops thrive in this optimal range (specifically 6.0 to 7.0) because plant nutrients are at their maximum availability.
Alkaline Soil (pH > 7.3): Soil with a pH greater than 7.3 is classified as alkaline (or basic). This is common in arid or semi-arid regions where high levels of calcium carbonate are present.
Quick Summary Table
| Soil Type | pH Range | Characteristics / Nutrient Availability |
|---|---|---|
| Acidic | Below 6.5 | High in hydrogen ions; often treated with lime (calcium carbonate) to raise pH. |
| Neutral | 6.5 to 7.3 | Ideal for most plants; balanced microbial activity and nutrient uptake. |
| Alkaline | Above 7.3 | High in calcium/sodium; often treated with sulfur or gypsum to lower pH. |
Important Questions from Equilibrium
Bee sting leaves an acid which causes pain and irritation. The acid released is
Which one of the following salts does not possess water of crystallization?
Which one of the following was the first mineral acid discovered?
What is the colour of the precipitate obtained by passing CO 2gas through lime water ?
Which among the following is NOT true with respect to colloidal solution?
