Page 105 - Chemistry - XI

TOMATO
S. No. Experiment Observation Inference
1. Carbohydrates
(a) To 2 mL of the juice, add 2–3 drops of conc. Black colour is Carbohydrate is
H SO . appeared. indicated.
2 4
(b) To the juice, add Molisch reagent. A violet ring is formed. Carbohydrate is
confi rmed.
2. Proteins

(a) To the juice, add conc. HNO and heat. No colour change. Protein is absent.
3
(b) To the juice, add Millon’s reagent. No ppt. is formed. Protein is absent.

(c) Perform the biuret test. No colour change. Protein is absent.

3. Starch
(a) Add iodine solution. No colour change. Starch is absent.

4. pH value
Add 1–2 drops of universal indicator. Juice has a pH value It is acidic.
of 4.

RADISH
S. No. Experiment Observation Inference

1. Carbohydrates
(a) To 2 mL of the juice, add 2–3 drops of Black colour is Carbohydrate is
conc. H SO . appeared. indicated.
2 4
(b) To the juice, add Molisch reagent. A violet ring is formed. Carbohydrate is
confi rmed.

2. Proteins
(a) To the juice, add conc. HNO and heat. No colour change. Protein is absent.
3
(b) To the juice, add Millon’s reagent. No ppt. is formed. Protein is absent.
(c) Perform the biuret test. No colour change. Protein is absent.

3. Starch
(a) Add iodine solution. No colour change. Starch is absent.

4. pH value
Add 1–2 drops of universal indicator. Juice has a pH value It is slightly acidic.
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