Question

1. which is true about metals used for jewelry, such as platinum and gold? they have low reactivity. they have high reactivity. they have low flammability. they have high flammability.

Explanation:

Platinum and gold are noble metals. Noble metals are known for their low reactivity. They do not easily react with other substances (like oxygen, acids in normal conditions etc.). Flammability is about a substance's ability to catch fire and burn. Platinum and gold are not flammable. And since they are used for jewelry (which is meant to last a long time without getting corroded easily), their low reactivity is a key property. High - reactivity metals would react with substances in the environment (like moisture, air etc.) and would not be suitable for long - lasting jewelry.

Answer:

They have low reactivity.