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Copper turns a green-brown when it is exposed to oxygen in air. What chemical property of oxygen causes this effect? A. its reactivity B. its volume C. its mass D. its flammability

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Answer:

A. reactivity

Step-by-step explanation:

User Tanvi B
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Answer:

A. its reactivity

Step-by-step explanation:

It's reactivity because copper was exposed to air and if it is reactivity it must be exposed to air

User Lenox
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