Question

(ii) Carbohydrates can be tested by using
(a) iodine solution
(b) caustic soda
(c) copper sulphate
(d) fehling solution

Answer 1

Answer:

a)iodine solution

Explanation:

carbohydrate or sugar when in touch of iodine solution turns to purple so it can be tested using iodine solution

Answer 2

Answer:

The correct options are (a) Iodine solution and (d) Fehling solution.

Explanation:

Fehling's Test

• Reducing sugars present in the substance give the test.

1. We add a few drops of fehling's solution to the sample.
2. The sample is then heated in a water bath.
3. We observe the formation of red precipitate which confirms the presence of reducing sugar in the sample.

Iodine Test

• Starch present in the substance gives the test.

1. Take the sample in a test tube and add a few drops of iodine solution.
2. We observe the sample change its color to blue. This confirms the presence of starch.
3. Upon heating the color disappears, and upon cooling blue reappears.