Select all that apply to the property of hardness.

Hardness is a physical property

Hardness is indicative of the strength of chemical bonds between elements.

Hardness is determined through a complicated process that requires expensive instruments.

Friedrich Mohs developed the standard hardness scale.

Diamond can scratch quartz.

All the above statements apply to hardness except the one that states that hardness is determined through a complicated process that require expensive instruments. Testing for hardness does not requires any expensive equipment, it only requires two objects, one of known hardness and the other is the one whose hardness you want to determine.

The correct statements are:

Hardness is a physical property

Friedrich Mohs developed the standard hardness scale.

Diamond can scratch quartz.