BIOLOGY

JAMB 2015 - Question 21

Biology 2015 JAMB Past Questions - Question 21: A crucible of 5gm weighed 10gm after filling with fresh soil. It is then heated in an oven at 1000C for 1 hour. After cooling in a desiccators, the weight was 8gm. The percentage of water in the soil is

Choose the most appropriate option for the gap .
A crucible of 5gm weighed 10gm after filling with fresh soil. It is then heated in an oven at 1000C for 1 hour. After cooling in a desiccators, the weight was 8gm. The percentage of water in the soil is
A:
B:
C:
D:
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Correct Answer

C

Explanation

wt of crucible = 5gmwt of crucible + fresh soil before heating = 10gwt of fresh soil before heating =10-5= 5gmwt of crucible + fresh soil after heating = 8gm.wt of water is wt of crucible +fresh soil before heating - wt of crucible + fresh soil after heating =10 - 3 =2gm. Percentage of water in the soil = wt of water = 2/5 wt of soil = 0.4