EX 4 TEST RESULTS

Question 1

STARCH

amylose gives a ____ color with iodine soln

Answer 1

BLUE

Question 2

STARCH

amylopectin gives ____ color with iodine soln

Answer 2

VIOLET

Question 3

STARCH

dextrin gives ____ color if it is ____ with iodine soln

Answer 3

red, partially hydrolyzed

Question 4

STARCH

a polysaccharide that does not form colored complexes with iodine soln

Answer 4

cellulose

Question 5

starch granules ____ and ____

Answer 5

swell and burst

Question 6

starch liquid ____ and ____

Answer 6

thickens & gelatinized

Question 7

STARCH | pH

corn starch

Answer 7

neutral

Question 8

STARCH | pH

wheat starch

Answer 8

neutral

Question 9

STARCH | pH

rice starch

Answer 9

alkaline

Question 10

STARCH | pH

potato starch

Answer 10

acidic

Question 11

Glycogen yields ____ color with iodine

Answer 11

reddish brown

Question 12

TEST FOR CARBOHYDRATES | TEST RESULT

Molisch test

Answer 12

red/purple ring at the junction

Question 13

TEST FOR CARBOHYDRATES | REAGENT

Molisch test

Answer 13

a-naphthol with conc. H₂SO₄

Question 14

TEST FOR CARBOHYDRATES | TEST RESULT

Fehling’s test result for glucose & fructose

Answer 14

BRICK RED

Question 15

TEST FOR CARBOHYDRATES | REAGENT

Fehling’s B

Answer 15

sodium potassium tartrate (rochelle’s salt)

Question 16

TEST FOR CARBOHYDRATES | TEST RESULT

Bial’s test

Answer 16

bluish green w/o ppt

Question 17

TEST FOR CARBOHYDRATES | REAGENT

Fehling’s A

Answer 17

copper sulphate

Question 18

TEST FOR CARBOHYDRATES | TEST RESULT

Benedict’s test

Answer 18

blue
green
yellow
orange
brick red

Question 19

general test for carbohydrates

Answer 19

MOLISCH TEST

Question 20

test for reducing sugars

Answer 20

Fehling
Benedict

Question 21

TEST FOR CARBOHYDRATES | TEST RESULT

Barfoed’s test

Answer 21

light red ppt

Question 22

TEST FOR CARBOHYDRATES | TEST RESULT

Fehling’s test result for saccharose

Answer 22

blue

Question 23

TEST FOR CARBOHYDRATES | TEST RESULT

BARFOED’S:
disaccharides produce the red ppt in how many mins

Answer 23

10mins

Question 24

test for pentoses

Answer 24

bial’s orcinol test
furfural test

Question 25

test to distinguish between **monosaccharides** and **disaccharides**

Answer 25

Barfoed's test

Question 26

**heat** a solution of the substance **in a test tube** with an **equal volume of HCl** containing **orcinol** and **ferric ions**

Answer 26

Bial's orcinol test

Question 27

# **TEST FOR CARBOHYDRATES | TEST RESULT** BARFOED'S: **monosaccharides** produce the red ppt in **how many mins**

Answer 27

2-3 mins

Question 28

# **TEST FOR CARBOHYDRATES | REAGENT** **Barfoed's** test

Answer 28

copper acetate in acetic acid ## Footnote not a reactive as benedict's reagent

Question 29

# **TEST FOR CARBOHYDRATES | TEST RESULT** OSAZONE: **glucose** & **fructose**

Answer 29

needle-like

Question 30

# **TEST FOR CARBOHYDRATES | TEST RESULT** OZASONE: **maltose**

Answer 30

sunflower

Question 31

# **TEST FOR CARBOHYDRATES | TEST RESULT** OSAZONE: **lactose**

Answer 31

cotton ball

Question 32

**heating** a sugar solution with **phenylhydrazine HCl**, **sodium acetate** and **acetic acid**

Answer 32

Osazones

Question 33

test for **ketoses**

Answer 33

Seliwanoff's test

Question 34

# **TEST FOR CARBOHYDRATES | TEST RESULT** Osazone formation

Answer 34

yellow crystals

Question 35

# **TEST FOR CARBOHYDRATES | TEST RESULT** OSAZONE: **galactose**

Answer 35

thorny ball

Question 36

a **crystal** of **resorcinol** is added to the solution and **warmed** on a **water bath** with an **equal volume of conc. HCl**

Answer 36

Seliwanoff's test

Question 37

test for **deoxysugars**

Answer 37

Keller-kiliani

Question 38

# **TEST FOR CARBOHYDRATES | TEST RESULT** SELIWANOFF: **aldo**hexose

Answer 38

light pink

Question 39

# **TEST FOR CARBOHYDRATES | TEST RESULT** **Keller-kiliani** test

Answer 39

reddish brown

Question 40

# **TEST FOR CARBOHYDRATES | TEST RESULT** SELIWANOFF: **keto**hexose

Answer 40

deep red

Question 41

a **deoxysugar** is dissolved in **acetic acid** containing trace of **ferric chloride** and transferred to the surface of **conc. H₂SO₄**

Answer 41

Keller-kiliani

Question 42

* a carbohydrate sample is **heated** in a **test tube** with a **drop of syrupy phosphoric acid** to convert it into **furfural** * a **disk of filter paper moistened** with a **drop of 10% soln of aniline** in **10% acetic acid** is placed over the mouth of the test tube. the **bottom** of the test tube is **heated** for **30-60s**

Answer 42

furfural test

Question 43

%yield for **pectin**

Answer 43

wt of **pectin** / wt of the **mesocarp** x 100

Question 44

# **TEST FOR CARBOHYDRATES | TEST RESULT** **Furfural** test

Answer 44

pink or red stain