PHYSICAL AND CHEMICAL CHANGES

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Across
  1. 2. Evolution of gas is confirmed by appearance of
  2. 5. Two compounds react in their aqueous state
  3. 6. depositing a layer of zinc on iron
  4. 7. Involves addition of hydrogen
Down
  1. 1. An acid reacts with a base
  2. 3. atoms are arranged in a regular pattern
  3. 4. Involves addition of oxygen