Physical & Chemical change

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Across
  1. 3. Colour of copper sulphate crystals
  2. 6. __ changes cannot be reversed
  3. 8. A feature of chemical change
Down
  1. 1. A chemical change occurring in human body
  2. 2. A feature of physical changes
  3. 4. Its colour turns milky on passing carbon dioxide gas through it
  4. 5. A method of preventing rusting of iron
  5. 7. Soda A compound when added to vinegar liberates hydrogen gas