Question

Identify the following reactions
1) digestion of food in our body
2)Rusting of iron
3)Heating of manganese dioxide with aluminium powder
4) blue colour of copper sulphate solution disappears when iron filings are added to it.
5)Dilute Hcl is added to NaOH solution to form NaCl and water

Answer 1

1. Decomposition reaction. Complex macromolecules in food like starch, proteins and lipids are broken into simpler molecules.
2. Synthesis reaction. Oxide of iron is formed.
3. Single displacement reaction. Al displaces Mn from its oxide as Al is more reactive than Mn.
4. Single displacement reaction. Fe displaces copper from its salt.
5. Double displacement reaction.