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Solution


Q.

A few drops of iodine solution were added to rice water. The solution turned blue-black in colour. This indicates that rice water contains : 
1 Complex proteins  
2 Simple proteins  
3 Starch  
4 Fats  

Ans.

(3)

Due to the presence of starch, when iodine solution was added to rice water, the solution becomes blue-black. Iodine forms starch iodide complex when it comes in contact with the amylose structure of starch. The blue-black colour comes from the starch iodide complex.