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Standard VII
Chemistry
Physical Change
Question

Identify the physical change in the following:
  1. Reaction of zinc metal with dilute sulphuric acid.
  2. Formation of solutions of soluble substances in water.
  3. Burning of coal
  4. Photosynthesis

A
Formation of solutions of soluble substances in water.
B
Burning of coal
C
Reaction of zinc metal with dilute sulphuric acid.
D
Photosynthesis
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Solution
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Water-soluble substances dissolve in it and form solutions and can be obtained back by evaporation and evaporation is a physical change.

In the other cases, there is the formation of a new chemical substance.

Hence, the correct option is B.

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