The best option is melting point
Answer : The conversion used is,
Explanation :
The conversion used :

For example : To convert 10 feet into inches.



From this we conclude that, the conversion factor used in the numerator and denominator for 1 feet should be, 
FeI2 (B). Group 1 elements (K) dissociate completely, so KCH3CO2 will become K+ and CH3CO2- . Fe2+ and I- don't dissociate in water, so you get FeI2(s) precipitate.
Answer:
Boil the water until it evaporates
Explanation:
If the water evaporates the sugar will no longer bond to it and then percipitate at the bottom of the beaker.
Green colored precipitate of iron (||) hydroxide