1) ⁠When electricity is passed through argon at low pressure, it glows: a) Red b) Green c) Blue-violet d) Yellow 2) Argon is commonly used in: a) Welding and lighting b) Batteries c) Plastics d) Nuclear fuel 3) Argon is: a) Reactive b) Slightly reactive c) Completely inert d) A metal 4) Argon is a ____ at room temperature. a) Solid b) Liquid c) Gas d) Plasma 5) Argon is often used to protect metals because it: a) Reacts with them b) Provides an oxygen-free atmosphere c) Absorb heat d) Is highly flammable

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