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Standard VII
Chemistry
Chemical Change
Question

Which of the following is not a chemical change?
  1. Converting water into steam
  2. Making curd from milk
  3. Rusting of iron
  4. Heating coal

A
Converting water into steam
B
Making curd from milk
C
Rusting of iron
D
Heating coal
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Solution
Verified by Toppr

(a) Rusting of iron :- chemical change
Fe(S)+O2+3H2O⟶Fe2O3.3H2O
irreversible
composition changed

(b) H2O(l)⇌H2O(g)
(water) (stream)
(reversible) ↓
no change in composition only state charge
Hence reversible change and physical change.
(c) Milk → Curd
chemical change
(d) Burning of coal is a chemical change.
The chemical reaction for this-
C+O2→CO2+H2O

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