Question

The T.L.V values of four pollutants A,B,C and D are 9 ppm, 10 ppm, 100 ppm and 500 ppm respectively. The most toxic is:

• A. A
• B. B
• C. C
• D. D

Answer 1

The correct option is A A

TLV refers to the threshold limit value. This is the value which defines that above this level the compounds is toxic. Lower the TLV value, higher the toxicity. Therefore, A is most toxic.

Thus, the correct answer is option A.