Friday 29 January 2021

CBSE Class 12 Chemistry - MCQ and Online Tests - Unit 14 - Biomolecules

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.
MCQ Questions for Class 12 Chemistry Chapter 14 Biomolecules with Answers
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 MCQ Questions for Class 12 Chemistry Chapter 14 Biomolecules with Answers 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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