BIOLOGY

JAMB 2007 - Question 6

Biology 2007 JAMB Past Questions - Question 6: A crucible of 5 gm weighed 10 gm 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

Choose the most appropriate option for the gap .
A crucible of 5 gm weighed 10 gm 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:
B:
C:
D:
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Correct Answer

D

Explanation

Wt.of crucible + fresh(wet) soil = 10gm. Wt. of crucible = 5qm.Wt. of fresh (wet) soil = 5gm Wt. ofcrucible + dry soil = 8gm. Wt.of dry soil is (8 -) gm =3gmWt. of water = (wt. of wet soil- wt. of dry soil) (5 - 3 ) = 2gm% of water in the soil = wt. of H20x 100 %wt. of wet soil 1= 2 X 100%= 40%