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JAMB Biology 2011 Paper

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Question : 22

Total: 48

In an experiment to determine the percentage of humus and water in a soil sample, the following results were obtained
Weight of the evaporating basin alone = 80.5g
Weight of basin and soil = 101.5g
Weight after drying the soil in the oven = 99.0g
Weight of basin and roasted soil = 95.5g
The percentage of humus in the soil sample is

16.7%
17.6%
26.7%
16.2%

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