Answer:
evaporation and condensation.
PS: check the complete question below.
Explanation:
Complete question: suppose ice water is in a closed container at a constant 20C, what reversible reactions occur in the container?
a. melting and freezing
b. evaporation and condensation
c. water formation and decompostion to hydrogen and oxygen
d. sublimation and depostion.
SOLUTION: the reversible Reaction that will occur here is that of the second option, that is option 'b'.
Okay, so before we answer this tricky question, let us define what condensation and evaporation is.
====> When vapour(that is gas) Is be changed or converted or transformed from its state(which is gas) to liquid, the change of state of matter is known as CONDENSATION.
====> When liquid is being changed or converted or transformed from its state to gas, then the change of state of matter is known as EVAPORATION.
So, if you leave ice water inside the container at that temperature the ice water is going to be evaporated, that is changes to gas, but you will notice something, when you open the container the lid on the container will have droplets of water attached to it and that means that condensation has taken place.
So the correct option is option 'b' which is evaporation and condensation.
