Which of the following is not poisonous to humans? Options: A . &nbspFlue gases B . &nbspStack gases C . &nbspHCl D . &nbspNone of the mentioned

Which of the following is not poisonous to humans?

Question

Which of the following is not poisonous to humans?

Options:

A . Flue gases

B . Stack gases

C . HCl

D . None of the mentioned

Answer: Option D
Answer: (d).None of the mentioned

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