Understanding pH Values and Their Impact

What does a pH value of 7 signify?

• Strongly acidic

• Strongly basic

• Slightly acidic

• Neutral

What is the effect of a neutral pH on a substance?

• It becomes toxic

• It becomes acidic

• No change in acidity or basicity

• It becomes basic

What does a pH value below 7 indicate?

• Acidic

• None of the above

• Neutral

• Basic

Which pH range is considered ideal for most plants?

• 7.0 to 8.0

• 4.5 to 5.5

• 6.5 to 7.5

• 5.0 to 6.0

What is the pH value of rainwater typically?

• About 5.6

• About 7.0

• About 8.0

• About 3.5

What is the primary consequence of acid rain on marble structures?

• No effect

• They become shinier

• They turn yellowish brown

• They become stronger

What effect does acid rain have on human and animal health?

• Enhances skin

• No effect

• Causes harm

• Improves health

What happens to the availability of iron in soil when the pH increases?

• Increases

• Decreases

• Remains the same

• Becomes toxic

Why is it important for a farmer to know the pH of his soil?

• To ensure good plant growth

• To choose the right crops

• To market his produce

• To predict weather patterns

What causes the yellowing of plants according to the video?

• Overwatering

• Lack of sunlight

• High soil pH reducing iron absorption

• Pests