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TLV of four gaseous pollutants A, B, C, and D are respectively 32, 9, 120, and 86. The more dangerous among the four is

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Gas A

Gas C

Gas B

Gas D

answer is B.

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Detailed Solution

The threshold limit value is the limit/level (of toxicity) up to which a worker can be exposed on a daily basis for over a lifetime of working, without adverse effects in terms of health.

The lower the value of TLV, the more its toxicity, and hence 9ppm i.e., gas B is the more dangerous among the four.

Therefore, option (B) is correct.

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