1. Classify the changes involved in the following processes as physical or chemical change :
a) Photosynthesis
b) Dissolving sugar in water
c) Melting of wax
d) Burning of coal
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Answer:
a) Photosynthesis- chemical change
b) Dissolving sugar in water- physical change
c) Melting of wax- physical change
d) Burning of coal- chemical change
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