Which of the following is NOT a physical change?

A. Melting of ice A.

B. Boiling of water B.

C. Sublimation of iodine C.

D. Rusting of iron D.

Correct Answer: D সঠিক উত্তর: D

Explanation ব্যাখ্যা

The process that is NOT a physical change is D) Rusting of iron.

Key Details:

Physical changes: These are changes in the state or appearance of a substance without altering its chemical composition. Melting, boiling, and sublimation of iodine are all examples of physical changes. These changes involve phase transitions, but the substance remains the same chemically.

Rusting of iron: This is a chemical change because iron reacts with oxygen and moisture to form iron oxide (rust), which is a new substance with different chemical properties than the original iron.

Key points about physical and chemical changes:

Physical changes are reversible: Melting ice can be reversed by freezing water. Boiling water can be reversed by condensation.
Chemical changes are irreversible: Rusting of iron cannot be easily reversed back to the original iron without specific chemical treatments.

Practice MCQ for SSC, UPSC, RRB Exams

Correct Answer: D সঠিক উত্তর: D

Explanation ব্যাখ্যা

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