Identifying Starch-Iodine Complex Color

What is the color of the starch-iodine complex?

A. Pink color

B. Purple color

C. Brown color

D. Black color

Answer:

The color of the starch-iodine complex is D. Black color.

When starch reacts with iodine, it forms a complex which results in a black color. This black color indicates the presence of starch in the substance being tested. It is an important reaction to identify the presence of starch in various materials, such as food products or biological samples.

The black color of the starch-iodine complex is due to the formation of a blue-black color when iodine molecules interact with the carbohydrate structure of starch. This reaction is commonly used in laboratory settings to determine the presence of starch, as it provides a visible color change that can be easily observed.

In conclusion, the color of the starch-iodine complex is black, specifically a blue-black color, which is a distinctive indicator of the presence of starch in the tested material.