Question

Persons are medically considered to have lead poisoning if they have a concentration greater than 10 micrograms of lead per decilitre of blood. Concentration in parts per million is:

• A. 1000
• B. 100
• C. 10
• D. 1

Answer 1

Answer: (B)

100

Given, Mass = 10 micrograms
= $10\times {10}^{-6}\text{grams}$
Volume = 0.1 litre
Concentration in ppm = $\frac{\text{Mass}}{\text{Volume}}\times {10}^6$
= $\frac{10\times {10}^{-6}}{0.1}\times {10}^6$
$\text{Cocentration}\text{in}\text{ppm}=100$
Hence, option (B) is correct.