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Q: Which of the following is a chemical change?
  • A. Souring of Butter
  • B. Making of dry ice from CO2
  • C. Heating a platinum wire
  • D. Iron magnetization
Correct Answer: Option A - The changes in which new substances are formed are called chemical changes, this is an irreversible process i.e original substance cannot be obtained by the newly formed products. Example –souring of butter, paper burning, rusting of iron, etc.
A. The changes in which new substances are formed are called chemical changes, this is an irreversible process i.e original substance cannot be obtained by the newly formed products. Example –souring of butter, paper burning, rusting of iron, etc.

Explanations:

The changes in which new substances are formed are called chemical changes, this is an irreversible process i.e original substance cannot be obtained by the newly formed products. Example –souring of butter, paper burning, rusting of iron, etc.