CBSE · Class 7 · Science · Physical and Chemical ChangesWhich of the following represents a chemical change?
Step-by-Step Solution
Rusting of iron is a chemical change because a new substance (iron oxide) is formed, and the change is generally irreversible under normal conditions.
Detailed Options Breakdown
Option : Boiling of water
Incorrect choice. This distractor represents a common misunderstanding of the core principles of Physical and Chemical Changes.
Option 1: Breaking of a glass tumbler
Incorrect choice. This distractor represents a common misunderstanding of the core principles of Physical and Chemical Changes.
Option 2: Rusting of iron (Correct Answer)
Correct choice. Refer to the step-by-step verified solution guidelines above for details.
Option 3: Dissolving sugar in water
Incorrect choice. This distractor represents a common misunderstanding of the core principles of Physical and Chemical Changes.
💡 Study Guide: This question tests core syllabus concepts from Physical and Chemical Changes. For formulas, key summaries, and mock exam reference guides, read the full Physical and Chemical Changes Revision Notes.