CBSE Class 12 Chemistry – MCQ and Online Tests – Unit 14 – Biomolecules
Every year CBSE conducts board exams for 12th standard. These exams are very competitive to all the students. So our website provides online tests for all the 12th subjects. These tests are also very effective and useful for those who preparing for competitive exams like NEET, JEE, CA etc. It can boost their preparation level and confidence level by attempting these chapter wise online tests.
These online tests are based on latest CBSE Class 12 syllabus. While attempting these our students can identify the weak lessons and continuously practice those lessons for attaining high marks. It also helps to revise the NCERT textbooks thoroughly.
CBSE Class 12 Chemistry – MCQ and Online Tests – Unit 14 – Biomolecules
Question 1.
Which of the following compounds is found abundatly in nature?
(a) Fructose
(b) Starch
(c) Glucose
(d) Cellulose
Answer
Answer: (b) Starch or (d) Cellulose
Question 2.
Which reagent is used to convert glucose into saccharic acid?
(a) Br2/H2O
(b) Nitric acid
(c) Alkaline solution of iodine
(d) Ammonium hydroxide
Answer
Answer: (b) Nitric acid
Question 3.
Maltose is made up of
(a) two α-D-glucose
(b) normal β-D-glucose
(c) α- and β-D-glucose
(d) fructose
Answer
Answer: (a) two α-D-glucose
Question 4.
What is the basic formulae for starch?
(a) (C6H12O6)n
(b) (C6H10O5)n
(c) C12O12O11
(d) (C6H12O4)n
Answer
Answer: (b) (C6H10O5)n
Question 5.
Whicn of the following is an example of an aldopentose?
(a) D-Ribose
(b) Glyceraldehyde
(c) Fructose
(d) Erythrose
Answer
Answer: (a) D-Ribose
Question 6.
The glycosidic linkage involved in linking the glucose units in amylose part of starch is
(a) C1-C4 β-linkage
(b) C4-C6 β-linkage
(c) C1-C6 α-linkage
(d) C1-C4 α-linkage
Answer
Answer: (d) C1-C4 α-linkage
Question 7.
Invert sugar is
(a) a type of cane sugar
(b) optically inactive form of sugar
(c) mixture of glucose and galactose
(d) mixture of glucose and fructose in equimolar quantities
Answer
Answer: (d) mixture of glucose and fructose in equimolar quantities
Question 8.
Identify Z.
(a) 2-lodoheptane
(b) Heptane-2-ol
(c) 2-lodohexane
(d) Heptanoic acid
Answer
Answer: (d) Heptanoic acid
Question 9.
Starch is composed of two polysaccharides which arc
(a) amylopectin and glycogen
(b) amylose and gtycogen
(c) amylose (20%) and amylopectin (80%)
(d) cellulose and glycogen
Answer
Answer: (c) amylose (20%) and amylopectin (80%)
Question 10.
Glycosidic linkage is an
(a) amide linkage
(b) ester linkage
(c) ether linkage
(d) acetyl linkage
Answer
Answer: (c) ether linkage
Question 11.
The general formula of carbohydrates is
(a) CnH2n+1O
(b) CnH2nO
(c) Cx(H2O)
(d) Cn(H2,O)2n
Answer
Answer: (c) Cx(H2O)
Question 12.
The a-and p-forms of glucose are
(a) isomers of D (+) glucose and L (-) glucose respectively
(b) diastereomers of glucose
(c) anomers of glucose
(d) isomers which differ in the configuration of C-2
Answer
Answer: (c) anomers of glucose
Question 13.
Carbohydrates are stored in human body as the polysaccharide
(a) starch
(b) glycogen
(c) cellulose
(d) amylose
Answer
Answer: (b) glycogen
Question 14.
The conversion of maltose into glucose is possible by the enzyme
(a) zymase
(b) lactase
(c) maltase
(d) diastase
Answer
Answer: (c) maltase
Question 15.
Cellulose is a
(a) hexapolysaccharide
(b) pentapolysaccharide
(c) tripolysaccharide
(d) None of these
Answer
Answer: (d) None of these
Question 16.
Which of the following treatment will convert starch directly into glucose?
(a) Heating with dilute H2SO4
(b) Fermentation by diastase
(c) Fermentation by zymase
(d) Heating with dilute NaOH
Answer
Answer: (a) Heating with dilute H2SO4
Question 17.
Which of the following is a non-reducing sugar?
(a) Glucose
(b) Sucrose
(c) Maltose
(d) Lactose
Answer
Answer: (b) Sucrose
Question 18.
In cellulose, D-glucose units are joined by
(a) α-1, 4 glycosidic linkage
(b) β-1, 6 glycosidic linkage
(c) β-1, 4 glycosidic linkage
(d) peptide linkage
Answer
Answer: (c) β-1, 4 glycosidic linkage
Question 19.
The anomeric carbon in D (+) glucose is
(a) C-1 carbon
(b) C-2 carbon
(c) C-5 carbon
(d) C-6 carbon
Answer
Answer: (a) C-1 carbon
Question 20.
What are the hydrolysis products of sucrose?
(a) Fructose + Fructose
(b) Glucose + Glucose
(c) Glucose + Galactose
(d) D-Glucose + D-Fructose
Answer
Answer: (d) D-Glucose + D-Fructose
Question 21.
Glucose 
Product is
(a) hexanoic acid
(b) gluconic acid
(c) saccharic acid
(d) bromohexane
Answer
Answer: (b) gluconic acid
Question 22.
On oxidation with a mild oxidising agent like Br2/H20, the glucose is oxidized to
(a) saccharic acid
(b) glucaric acid
(c) gluconic acid
(d) valeric acid
Answer
Answer: (c) gluconic acid
Question 23.
How many C-atoms are there is a pyranose ring?
(a) 3
(b) 5
(c) 6
(d) 7
Answer
Answer: (c) 6
Question 24.
Which one of the following is not correct?
(a) D(-) Fructose exist sin furanose structure
(b) D (+) Glucose exists in pyranose structure
(c) In sucrose the two monosaccharides are held together by peptide linkage
(d) Maltose is a reducing sugar
Answer
Answer: (c) In sucrose the two monosaccharides are held together by peptide linkage
Question 25.
During acetylation of glucose it needs ,v moles of.acetic anhydride. The value of x would be
(a) 3
(b) 5
(c) 4
(d) 1
Answer
Answer: (b) 5
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