Chemistry Syllabus (JEE Main)
Q. Which biomolecule is primarily responsible for energy storage in animals?
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A.
Proteins
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B.
Carbohydrates
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C.
Lipids
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D.
Nucleic acids
Solution
Lipids, particularly triglycerides, are the main form of energy storage in animals.
Correct Answer: C — Lipids
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Q. Which biomolecule is primarily responsible for storing genetic information?
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A.
Proteins
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B.
Lipids
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C.
Carbohydrates
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D.
Nucleic acids
Solution
Nucleic acids, such as DNA and RNA, are responsible for storing and transmitting genetic information.
Correct Answer: D — Nucleic acids
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Q. Which biomolecule is primarily responsible for the genetic information in cells?
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A.
Proteins
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B.
Lipids
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C.
Nucleic acids
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D.
Carbohydrates
Solution
Nucleic acids, such as DNA and RNA, are responsible for storing and transmitting genetic information.
Correct Answer: C — Nucleic acids
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Q. Which biomolecule is primarily responsible for the storage of genetic information?
-
A.
Proteins
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B.
Lipids
-
C.
Nucleic acids
-
D.
Carbohydrates
Solution
Nucleic acids, such as DNA and RNA, are responsible for storing and transmitting genetic information.
Correct Answer: C — Nucleic acids
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Q. Which biomolecule is used for energy storage in animals?
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A.
Glycogen
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B.
Cellulose
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C.
Starch
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D.
Chitin
Solution
Glycogen is the primary form of energy storage in animals.
Correct Answer: A — Glycogen
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Q. Which biomolecule is used for quick energy?
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A.
Proteins
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B.
Lipids
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C.
Carbohydrates
-
D.
Nucleic acids
Solution
Carbohydrates are primarily used for quick energy by living organisms.
Correct Answer: C — Carbohydrates
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Q. Which biomolecule serves as the main component of cell membranes?
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A.
Proteins
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B.
Carbohydrates
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C.
Nucleic acids
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D.
Phospholipids
Solution
Phospholipids are the main component of cell membranes, forming a bilayer structure.
Correct Answer: D — Phospholipids
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Q. Which bond is primarily responsible for the secondary structure of proteins?
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A.
Ionic bonds
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B.
Hydrogen bonds
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C.
Disulfide bonds
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D.
Peptide bonds
Solution
The secondary structure of proteins, such as alpha-helices and beta-sheets, is stabilized by hydrogen bonds between the backbone atoms.
Correct Answer: B — Hydrogen bonds
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Q. Which carbohydrate is a structural component of plant cell walls?
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A.
Starch
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B.
Glycogen
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C.
Cellulose
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D.
Fructose
Solution
Cellulose is a polysaccharide that provides structural support in plant cell walls.
Correct Answer: C — Cellulose
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Q. Which carbohydrate is commonly used as a sweetener?
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A.
Lactose
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B.
Maltose
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C.
Fructose
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D.
Cellulose
Solution
Fructose is commonly used as a sweetener due to its high sweetness level.
Correct Answer: C — Fructose
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Q. Which carbohydrate is found in milk?
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A.
Lactose
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B.
Maltose
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C.
Glucose
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D.
Fructose
Solution
Lactose is the sugar found in milk, composed of glucose and galactose.
Correct Answer: A — Lactose
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Q. Which carbohydrate is found in the structure of DNA?
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A.
Glucose
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B.
Ribose
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C.
Fructose
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D.
Mannose
Solution
Ribose is the sugar component of RNA, while deoxyribose is found in DNA.
Correct Answer: B — Ribose
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Q. Which carbohydrate is known as blood sugar?
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A.
Galactose
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B.
Fructose
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C.
Glucose
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D.
Ribose
Solution
Glucose is commonly referred to as blood sugar as it is the primary energy source for the body's cells.
Correct Answer: C — Glucose
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Q. Which carbohydrate is primarily stored in animal liver and muscle?
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A.
Cellulose
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B.
Starch
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C.
Glycogen
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D.
Fructose
Solution
Glycogen is the carbohydrate primarily stored in animal liver and muscle as a form of energy reserve.
Correct Answer: C — Glycogen
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Q. Which chemical compound is primarily responsible for ozone depletion?
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A.
CFCs
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B.
CO2
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C.
SO2
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D.
NOx
Solution
Chlorofluorocarbons (CFCs) are primarily responsible for ozone depletion in the stratosphere.
Correct Answer: A — CFCs
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Q. Which chemical is commonly used as a food preservative?
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A.
Sodium chloride
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B.
Sodium benzoate
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C.
Vinegar
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D.
Sugar
Solution
Sodium benzoate is a widely used food preservative that inhibits the growth of bacteria and fungi.
Correct Answer: B — Sodium benzoate
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Q. Which chemical is commonly used to treat drinking water?
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A.
Chlorine
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B.
Fluoride
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C.
Sodium bicarbonate
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D.
Sulfuric acid
Solution
Chlorine is commonly used to disinfect drinking water and kill harmful bacteria.
Correct Answer: A — Chlorine
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Q. Which chemical is primarily responsible for ozone depletion?
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A.
Carbon Dioxide
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B.
Chlorofluorocarbons (CFCs)
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C.
Methane
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D.
Sulfur Dioxide
Solution
Chlorofluorocarbons (CFCs) are primarily responsible for ozone depletion in the stratosphere.
Correct Answer: B — Chlorofluorocarbons (CFCs)
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Q. Which chemical is primarily responsible for the depletion of the ozone layer?
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A.
Carbon Dioxide
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B.
Chlorofluorocarbons (CFCs)
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C.
Methane
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D.
Sulfur Dioxide
Solution
Chlorofluorocarbons (CFCs) are responsible for the depletion of the ozone layer, as they release chlorine atoms that destroy ozone molecules.
Correct Answer: B — Chlorofluorocarbons (CFCs)
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Q. Which colligative property can be used to determine the molar mass of a solute?
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A.
Vapor pressure lowering
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B.
Boiling point elevation
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C.
Freezing point depression
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D.
All of the above
Solution
All of these colligative properties can be used to determine the molar mass of a solute.
Correct Answer: D — All of the above
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Q. Which colligative property is affected by the presence of electrolytes?
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A.
Vapor pressure lowering
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B.
Boiling point elevation
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C.
Freezing point depression
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D.
All of the above
Solution
Electrolytes dissociate into ions, affecting all colligative properties by increasing the number of solute particles.
Correct Answer: D — All of the above
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Q. Which colligative property is used to determine molar mass of a solute?
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A.
Boiling point elevation
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B.
Freezing point depression
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C.
Osmotic pressure
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D.
All of the above
Solution
All of these colligative properties can be used to determine the molar mass of a solute by applying the appropriate formulas.
Correct Answer: D — All of the above
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Q. Which colligative property is used to determine the molar mass of a solute?
-
A.
Boiling point elevation
-
B.
Freezing point depression
-
C.
Osmotic pressure
-
D.
All of the above
Solution
All of the listed colligative properties can be used to determine the molar mass of a solute.
Correct Answer: D — All of the above
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Q. Which compound can exhibit both structural and geometric isomerism?
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A.
C2H4
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B.
C4H8
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C.
C5H10
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D.
C3H6
Solution
C4H8 can exhibit both structural isomerism (different structures) and geometric isomerism (cis/trans forms).
Correct Answer: B — C4H8
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Q. Which compound does NOT exhibit optical isomerism?
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A.
Lactic acid
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B.
Glucose
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C.
2-butanol
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D.
Butan-2-one
Solution
Butan-2-one does not have a chiral center and therefore does not exhibit optical isomerism.
Correct Answer: D — Butan-2-one
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Q. Which compound is commonly used as a preservative in food?
-
A.
Sodium chloride
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B.
Sodium benzoate
-
C.
Potassium nitrate
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D.
Calcium carbonate
Solution
Sodium benzoate is widely used as a food preservative to prevent spoilage.
Correct Answer: B — Sodium benzoate
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Q. Which element has the electronic configuration 1s2 2s2 2p6 3s2 3p1?
Solution
The element with the configuration 1s2 2s2 2p6 3s2 3p1 is Aluminum (Al).
Correct Answer: A — Al
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Q. Which element has the electronic configuration 1s2 2s2 2p6 3s2 3p6 4s2?
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A.
Arsenic
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B.
Calcium
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C.
Krypton
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D.
Titanium
Solution
The configuration corresponds to Krypton (Kr), which has 36 electrons.
Correct Answer: C — Krypton
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Q. Which enzyme breaks down starch into glucose?
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A.
Amylase
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B.
Lactase
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C.
Sucrase
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D.
Cellulase
Solution
Amylase is the enzyme that catalyzes the hydrolysis of starch into glucose.
Correct Answer: A — Amylase
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Q. Which enzyme is responsible for the hydrolysis of starch?
-
A.
Amylase
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B.
Cellulase
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C.
Lactase
-
D.
Maltase
Solution
Amylase is the enzyme that catalyzes the hydrolysis of starch into sugars.
Correct Answer: A — Amylase
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