What Is the Obverse of the Proposition "Some Chemicals Are

question 164

Multiple Choice

What is the obverse of the proposition "Some chemicals are not toxic substances"?

• A)Some chemicals are nontoxic substances.
• B)Some toxic substances are non-chemicals.
• C)No toxic substance is a non-chemical.
• D)No chemical is a nontoxic substance.
• E)All nontoxic substances are chemicals.

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