Question

By placing a soil sample at 105° C for 24 hours in an oven, which of the following statements are correct? (A) Hygroscopic moisture is lost
(B) Capillary water is lost
(C) Free water is lost
(D) Structural water is lost
Which of the above statements are correct?

• A. (A), (B) and (D) only
• B. (B), (C) and (D) only
• C. (A), (B), (C) and (D)
• D. (A), (B) and (C) only

Hint:

Heating soil at 105° C for 24 hours removes hygroscopic moisture, capillary water, free water, and structural water.

Answer 1

The Correct Option is C

Step 1: Understanding the Effect of Heating Soil at 105° (C)
- (A) Hygroscopic moisture is lost: Heating soil at 105° C removes the hygroscopic moisture, which is bound to the soil particles.
- (B) Capillary water is lost: Capillary water, which is water present in the small pores of the soil, is also removed by heating.
- (C) Free water is lost: Free water, which is not bound to the soil particles, is lost during the heating process.
- (D) Structural water is lost: Structural water, which is part of the mineral structure, is also lost when the soil is heate(D)

Step 2: Conclusion.
Thus, all the statements (A), (B), (C), and (D) are correct, making option (3) the correct answer.

Final Answer: \[ \boxed{3. \, (A), (B), (C) \, \text{and} \, (D)} \]