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Question
A gas is termed as non-toxic, if its maximum permissible concentration (TLV) ranges from __________ ppm.
Options:
A .  1000 to 2000
B .  3000 to 6000
C .  6000 to 9000
D .  10000 to 100000
Answer: Option D
Answer: (d).10000 to 100000

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