Question

What is the reaction when:
- coal is burnt.
- food is digested in our body.
- we respire.
- cracker is burnt.
- milk is converted into curd.
- water is added to quick lime.
- iron nail is exposed to humid atmosphere for a longtime.

Answer 1

C+O2=CO2+heat and light
then food we eat converted into simpler substance by enzymes
C6H12O6+O2=6CO2+6h2o+energy
by ignition gun powder blast
then milk which is nuetral convert into lactic acid
CaO+H20=Ca(OH)2
It gets corroded
Fe+O2+moisture=Fe3O4

Answer 2

1) A combustion reaction
2)decomposition reaction
3)exothermic reaction
4)exothermic reaction
6)decomposition reaction
7)rusting