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Class 12
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Qualitative Analysis of Carbohydrates
Qualitative Analysis of Carbohydrates
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1)
Which one of the following is a non-reducing sugar?
Lactose
Glucose
Maltose
Sucrose
2)
What is the composition of Molisch’s reagent?
Ammoniacal silver nitrate
Sodium potassium tartrate
Alcoholic solution of α-naphthol
Alkaline solution of β-naphthol
3)
What is the result observed in the Molisch’s test for carbohydrates?
Red precipitate
No characteristics change
Purple ring
Blue colouration
4)
Which product is formed in the Fehling’s test of reducing sugars?
Copper (II) oxide
Copper (II) hydroxide
Copper (I) oxide
Copper (II) sulphate
5)
Which one of the following tests is used for the detection of starch?
Fehling’s test
Iodine test
Benedict’s test
Tollen’s test
6)
Which one of the following is the correct observation in the Tollen’s test for reducing sugars?
A purple ring
Shining silver mirror
Blue colour in the solution
Reddish precipitate
7)
What is Fehling’s solution B?
1% iodine solution
Copper sulphate solution
Mixture of solutions of sodium potassium tartrate and NaOH
Alcoholic solution of α-naphthol
8)
Which one of the following carbohydrates is insoluble in water?
Starch
Glucose
Sucrose
Lactose
9)
Which one of the following solutions is used in Tollen’s test for reducing carbohydrates?
Ammoniacal silver nitrate
Sodium potassium tartrate
Copper (II) sulphate
Alcoholic solution of α-naphthol
10)
Which one of the following compounds is produced due to the dehydration of carbohydrates by Conc. sulphuric acid in Molisch’s test?
Acetic acid
Ethyl methyl ketone
Furfuraldehyde or its derivative
Formaldehyde
11)
Which one of the following ions is present in Benedict’s reagent?
Cu²⁺
Ag⁺
NH₄⁺
Cu⁺
12)
What is Fehling’s solution A?
Aqueous solution of copper (II) chloride
Aqueous solution sodium potassium tartrate
Aqueous solution of silver (I) nitrate
Aqueous solution of Copper (II) sulphate
13)
While performing an experiment in the lab, students tested for the presence of starch in a potato sample. Which one of the following reagents gives a positive result?
Fehling’s solution A
Tollen’s reagent
Fehling’s solution B
Iodine solution
14)
Identify the structure of glucose