JAMB Biology 2007 Objective — Question 38

Question 38 of 50 from the Joint Admissions and Matriculation Board (JAMB) Biology 2007 Objective paper, with the correct answer and a full explanation.

A crucible of 5 gm, weighed 10gm after filling with fresh soil. It is then heated in an oven at 100 C for 1 hour. After cooling in a desiccator, the weight was 8 gm. The percentage of water in the soil is

A. 20%
B. 40%Correct
C. 60%
D. 80%

Explanation

Mass of fresh soil = 10g - 5g = 5g. Mass after heating = 8g - 5g = 3g. Mass of water lost = 5g - 3g = 2g. Percentage of water = (2/5) x 100% = 40%.

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