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TLV value of four pollutants A, B C and ...

TLV value of four pollutants A, B C and D are 2ppm, 9 ppm, 20 ppm and 50 ppm. Among these four pollutants which one is the most toxic pollutant? Why ?

A

A

B

B

C

C

D

D

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The correct Answer is:
A
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