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A person is considered to be suffering from lead poisoning if its concentration in him is more than 15 micrograms of lead per decilitre of blood. Concentration in parts per billion parts is

Answer»

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0
100
1000

Solution :`10 mu g = 10xx10^(-6)g=10^(-5)g`
`"1 decilitre "=0.1 L=100mL`
Thus, 100 mL of blood CONTAIN LEAD `=10^(-5)g`
`therefore"1 billion "(10^(9))" parts will contain lead"`
`=(10^(-5))/(100)xx10^(9)=10^(2)="100 parts"`
i.e., concentration = 100 parts per billion parts


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