TLV of ozone (O3) and phosgene (COCl2) in air is __________ ppm.

1.

TLV of ozone (O₃) and phosgene (COCl₂) in air is __________ ppm.

[A].	0.1
[B].	25
[C].	100
[D].	1000

Answer: Option A

Explanation:

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