Cacbohidrat Practice Questions
THPT (Vietnam) · THPT Hóa học · 136 free MCQs with instant results and detailed explanations.
136
Total
38
Easy
72
Medium
26
Hard
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Sample Questions from Cacbohidrat
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Q1
Easy
Which of the following carbohydrates is a simple sugar?
A.
Glucose
B.
Starch
C.
Cellulose
D.
Glycogen
Show Answer & Explanation
Correct Answer: A
Glucose is classified as a monosaccharide, which is a simple sugar. Starch, cellulose, and glycogen are all polysaccharides, which are complex carbohydrates made up of multiple sugar units.
Q2
Easy
What is the main function of carbohydrates in the human body?
A.
To provide insulation
B.
To supply energy
C.
To build muscle
D.
To enhance vision
Show Answer & Explanation
Correct Answer: B
Carbohydrates are the body's primary source of energy. They are broken down into glucose, which fuels cellular activities. The other options do not accurately describe the primary role of carbohydrates.
Q3
Easy
Which of the following is a characteristic of dietary fiber, a type of carbohydrate?
A.
Easily digested
B.
Absorbs water
C.
Provides a high-caloric content
D.
Contains cholesterol
Show Answer & Explanation
Correct Answer: B
Dietary fiber is known for its ability to absorb water, which aids in digestion. It is not easily digested, does not provide high calories, and does not contain cholesterol.
Q4
Medium
Which carbohydrate is known as blood sugar and is the primary source of energy for the body's cells?
A.
Fructose
B.
Galactose
C.
Glucose
D.
Sucrose
Show Answer & Explanation
Correct Answer: C
Glucose is known as blood sugar and serves as a key energy source for the body's cells, making option C the correct answer.
Q5
Medium
What is the molecular formula of the disaccharide lactose?
A.
C12H22O11
B.
C6H12O6
C.
C12H24O12
D.
C6H10O5
Show Answer & Explanation
Correct Answer: A
Lactose, which is composed of glucose and galactose, has the molecular formula C12H22O11, making option A correct.
Q6
Medium
Which of the following carbohydrates is NOT a reducing sugar?
A.
Maltose
B.
Lactose
C.
Sucrose
D.
Glucose
Show Answer & Explanation
Correct Answer: C
Sucrose is not a reducing sugar because it does not have a free aldehyde or ketone group, making option C the correct choice.
Q7
Medium
During the hydrolysis of starch, which of the following products is formed first?
A.
Glucose
B.
Maltose
C.
Dextrins
D.
Cellulose
Show Answer & Explanation
Correct Answer: C
During starch hydrolysis, dextrins are formed first before further breakdown into glucose and maltose, making option C correct.
Q8
Hard
Which of the following statements about the structure of carbohydrates is true?
A.
All carbohydrates are composed solely of carbon, hydrogen, and oxygen in a 1:2:1 ratio.
B.
Carbohydrates can only exist in linear form and cannot form cycles.
C.
Monosaccharides are the simplest form of carbohydrates and cannot be hydrolyzed.
D.
Disaccharides are formed by the hydrolysis of monosaccharides.
Show Answer & Explanation
Correct Answer: C
Monosaccharides are indeed the simplest form of carbohydrates and cannot be hydrolyzed into simpler sugars, making option C correct. Options A, B, and D are incorrect as they misrepresent carbohydrate properties.
Q9
Hard
Which of the following statements correctly describes the structure of amylopectin in carbohydrates?
A.
Amylopectin is a branched polymer of glucose with alpha-1,4 and alpha-1,6 glycosidic bonds.
B.
Amylopectin consists only of linear chains of glucose linked by beta-1,4 glycosidic bonds.
C.
Amylopectin is a linear polymer that does not have any branches in its molecular structure.
D.
Amylopectin is a form of cellulose with extensive hydrogen bonding between chains.
Show Answer & Explanation
Correct Answer: A
Amylopectin is indeed a branched polymer consisting of glucose units connected by both alpha-1,4 and alpha-1,6 glycosidic bonds, which create branching points in the structure.
Q10
Hard
A carbohydrate contains 40% carbon, 6.67% hydrogen, and 53.33% oxygen by mass. What is the empirical formula of this carbohydrate?
A.
C6H12O6
B.
C3H6O3
C.
C4H8O4
D.
C5H10O5
Show Answer & Explanation
Correct Answer: B
To find the empirical formula, convert the percentages to moles: C (40 g) = 3.33 mol, H (6.67 g) = 6.67 mol, O (53.33 g) = 3.33 mol. The smallest molar ratio is 1:2:1, giving the formula C3H6O3.
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Cacbohidrat — THPT (Vietnam) THPT Hóa học Practice Questions Online
This page contains 136 practice MCQs for the chapter Cacbohidrat in THPT (Vietnam) THPT Hóa học. The questions are organized by difficulty — 38 easy, 72 medium, 26 hard — so you can choose the right level for your preparation.
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