Q5) When a few drops of iodine solution are added to rice water, the solution turns blue- black in colour. This indicates that rice water contains: (a) fats (b) complex proteins (c) starch (d) simple proteins
Amylose in starch is the main factor for colour formation as iodine comes in contact with beta coils structure of amylose and gives blue - black colour with iodine. Thus, the reaction of iodine with rice water indicates that rice water contains starch. So, the correct answer is option D – Starch.
