Question

which of the following examples shows a physical property of the given substance?
option 1: wax burns in oxygen
option 2: iron rusts in water
option 3: gold has high luster
option 4: silver tarnishes in air

Explanation:

To determine the physical property, we analyze each option:

• Option 1: Wax burning in oxygen is a chemical reaction (combustion), so it's a chemical property.
• Option 2: Iron rusting in water involves a chemical change (formation of rust), so it's a chemical property.
• Option 3: Gold having high luster is a characteristic that can be observed without changing the substance's chemical identity, so it's a physical property.
• Option 4: Silver tarnishing in air is a chemical change (reaction with substances in air), so it's a chemical property.

Answer:

Option 3. Gold has high luster