Question

Which of the following is not a chemical change?

A

Rusting of iron

B

Converting water into steam

C

Making curd from milk

D

Heating coal

Medium

Solution

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Correct option is B)

Rusting of iron :- chemical change

                           irreversible
                                           composition changed

 
    (water)           (stream)
(reversible)             
                           no change in composition only state charge
Hence reversible change and physical change.
Milk  Curd
                            chemical change
Burning of coal is a chemical change.
              The chemical reaction for this-
             

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