Tests for Carbohydrates

Q.

On treatment with iodine, the presence of starch gives blue-black colour because

1. Iodide ion is present

2. None of the above

3. Starch is actually blue-black in colour

4. Minerals are present

Q.

When mixed with iodine bread turns ___ in colour

1. Blue black

2. red

3. Purple

4. Pink

Q. Which of the following is non reducing sugar?

1. Glyceraldehyde
2. Glucose
3. Fructose
4. Sucrose

Q.

Name a gas which turns:
Starch iodide paper blue black