CBSE Class 10 Answered

2) Respiration: While respiration, glucose present in the blood reacts with the oxygen to form carbon monoxide and water, this an exothermic reaction.

       reaction occurs as :  C₆H₁₂O₆  + 6CO₂ → 6CO₂ + 6 H₂O + energy

3) Anaerobic respiration by bacterias, yeast: This is harnessed for fermentation to produce ethanol, carbon dioxide and other chemicals which are used in the making of cheese, wine, beer, yoghurt, bread, etc.

       The reaction occurs C₆H₁₂O₆  → 2C₂H₅OH + 2CO₂ + energy

4) Combustion: Burning a candle, build a fire or light a grill are the examples of the combustion reaction, the energetic molecules are combined with oxygen to produce carbon dioxide and water.

        The reaction occurs C₃H₈ + 5 O₂ →  4 H₂O + 3CO₂ + heat energy 

5) Rust: Iron articles develop a red-brown flaky coating called rust. Corrosion is an oxidation reaction. Also, other metals like copper and silver form their oxides over the time.

        The reaction of rusting of iron occurs  Fe + O₂ + H₂O  →  Fe₂O₃.xH₂O 

6) Batteries: these are examples of electrochemical redox reactions.

       Oxidation and reduction are occurring simultaneously.

7) Digestion: There are thousands of chemical reactions are taking place during digestion.  The hydrochloric acid apresent in the stomach is breaks the comlpex food materials to form simple compounds during digestion.

8) Soap and detergents: Soaps and detergents are bind the oily and dirty stains  with the soap molecule so that these stains are get remove.

and detergents acts as a surfactant and rinse away the dirt molecules.