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 billion is :

• A. 1000
• B. 100
• C. 10
• D. 1

Answer 1

Answer: (B)

100

Answer 2

10 $\mu$g per deciliter

$\Rightarrow$ 10 × 10–6 g in 100 mL

\ 109 parts (1 billion) has = $\frac { 10 \times 10 ^ { - 6 } } { 100 }$ × 109 g = 100 g