Question

Which one of the following is not a chemical reaction?
Ripening of fruit.
Electrolysis of water.
Disolulvation of common salt in water.
Heating a copper wire in the presence of air at high temperature .

Answer 1

Answer: Heating a copper wire in the presence of air at high temperature

Explanation:

Answer 2

This is not a chemical reaction – heating of copper wire in the presence of air at high temperature.  

Explanation:

• When copper wires are heated at very high temperature in presence of air, the metal reacts with the oxygen present in the air and creates what is known as the copper oxide that is black in color.
• The copper oxide on the other hand subsequently undergoes a reaction with the hydrogen to create water and the metal copper.
• As thermal energy is needed here and it leads to the creation of new structures, this is a physical change and not a chemical change.

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