When Benedict's test is positive, an orange-red precipitate forms when the Benedict's reagent is added to a solution contain reducing sugar. The iodine test is a chemical test for starch. When iodine solution which is red is added to starch it turns blue/black in colour.
Water is a liquid and it’s molecules are far apart and move pretty freely and ice is a solid so it’s molecules are packed in tightly and they don’t move.