Classification — inherent quality vs container–content: Pick the pair that does not express a natural property of the first: Ice cube : Cold, Iron : Hard, Marble : Smooth, Purse : Money.

Introduction / Context:
Three pairs give a characteristic or inherent attribute of the first noun; one pair gives a typical content rather than a property. Distinguishing property-of from contains/holds is the key.

Given Data / Assumptions:

• Ice cube → cold is an intrinsic state.
• Iron → hard is a material property.
• Marble → smooth is a surface property.
• Purse → money is not a property; it is a usual content.

Concept / Approach:
Ask: “Does the right-hand word describe what the left-hand item is like (inherent attribute), or what it typically contains?” Only one pair is container–content.

Step-by-Step Solution:
1) Ice cube : Cold → quality.2) Iron : Hard → material property.3) Marble : Smooth → surface quality.4) Purse : Money → content, not property.

Verification / Alternative check:
Swap to “seems/feels”: iron seems hard; a purse does not “seem money”; it may contain money.

Why Other Options Are Wrong:
Each expresses an inherent/typical attribute of the first noun.

Common Pitfalls:
Confusing common contents with intrinsic traits; content is contingent, not defining.

Final Answer:
Purse : Money