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Identify the correct set.  Set Physical Changes Chemical Changes A Ozone formation from Oxygen, Condensation Rusting, Burning of candle B Evaporation, Alloy formation Rusting, Curd formation C Condensation, Evaporation Combustion, Galvanization D Galvanization, Alloy formation Crystallization, Condensation

Identify the correct set.  Set Physical Changes Chemical Changes A Ozone formation from Oxygen, Condensation Rusting, Burning of candle B Evaporation, Alloy formation Rusting, Curd formation C Condensation, Evaporation Combustion, Galvanization D Galvanization, Alloy formation Crystallization, Condensation Correct Answer B

Concept:

Physical Change  Chemical Change 
  • A temporary change.
  • A permanent change.
  • Affects only the physical properties that are size, shape, etc. 
  • It affects both physical and chemical properties as well as the composition. 
  • Despite the fact that a substance's molecules are rearranged when it experiences a physical change, its composition remains the same.
  • A substance's molecular composition is completely altered when it experiences a chemical transformation. As a result, chemical transformations result in the production of new substances.
  • No new substance is formed. 
  • A new substance is formed.
  • Mostly, the physical change is reversible, meaning the original material can be regained.
  • Chemical transformations are mostly irreversible, which means that the original substance cannot be restored.

Examples - 

Melting of ice, Melting of wax, Boiling of water, etc. 

Examples - 

Burning of candle, Burning of paper, burning of wood, etc. 


Explanation:

  • Rusting of Iron is a chemical change. Iron reacts with moist air. Rust is a new substance formed from iron. 
  • Curd formation is a chemical change as curd has different chemical composition compared to milk. 
  • Evaporation is the process of conversion of solid into vapours before boiling point. The evaporated vapours of water and water in liquid form, both is same. Also, evaporated water can be condensed and could get back in form of liquids. 
  • Alloy is the physical homogeneous mixture of metals or metal with non - metals. No chemical reactions happen. This is a physical change. 

From the above explanation, we can say that set B represents the correct examples of physical and chemical changes. 

Additional Information

Ozone Formation 

  • Ozone is chemically O3. 
  • It is formed when the Ultraviolet rays convert atmospheric oxygen gas (O2) in O3. 
  • Clearlty, chemical composition has been changed and it is a chemical reaction. 

Galvanization

  • It is the process of protecting iron from getting rusted. 
  • The iron is dipped in molten zinc and a layer of zinc is formed over iron. 
  • No new chemical substance is formed. 

Condensation

  • Condensation is the process of converting vapours back to liquid after cooling. 
  • This is a physical change as both vapour and liquid water are the chemically the same compound. 

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