Q. What is the primary characteristic of a redox reaction? (2023)
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A.
Transfer of protons
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B.
Transfer of electrons
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C.
Change in temperature
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D.
Change in pressure
Solution
The primary characteristic of a redox reaction is the transfer of electrons between species.
Correct Answer: B — Transfer of electrons
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Q. What is the primary characteristic of alkaline earth metals? (2020)
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A.
They are highly reactive
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B.
They have a +2 oxidation state
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C.
They are gases at room temperature
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D.
They form covalent bonds
Solution
Alkaline earth metals typically have a +2 oxidation state due to the loss of two electrons.
Correct Answer: B — They have a +2 oxidation state
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Q. What is the primary characteristic of amorphous solids? (2023)
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A.
Long-range order
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B.
Short-range order
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C.
Definite melting point
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D.
High thermal conductivity
Solution
Amorphous solids have short-range order but lack long-range order, unlike crystalline solids.
Correct Answer: B — Short-range order
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Q. What is the primary difference between physisorption and chemisorption? (2023)
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A.
Physisorption is stronger than chemisorption
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B.
Chemisorption involves chemical bonds, while physisorption involves van der Waals forces
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C.
Physisorption is irreversible, while chemisorption is reversible
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D.
Chemisorption occurs at lower temperatures than physisorption
Solution
The primary difference is that chemisorption involves the formation of chemical bonds, while physisorption involves weaker van der Waals forces.
Correct Answer: B — Chemisorption involves chemical bonds, while physisorption involves van der Waals forces
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Q. What is the primary factor affecting the rate of a chemical reaction? (2022)
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A.
Concentration
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B.
Temperature
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C.
Catalyst
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D.
All of the above
Solution
All of the above factors affect the rate of a chemical reaction.
Correct Answer: D — All of the above
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Q. What is the primary force holding the atoms together in covalent network solids? (2022)
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A.
Ionic bonds
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B.
Covalent bonds
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C.
Metallic bonds
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D.
Van der Waals forces
Solution
Covalent network solids are held together by covalent bonds, forming a continuous network throughout the solid.
Correct Answer: B — Covalent bonds
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Q. What is the primary force holding together the atoms in a metallic solid? (2020)
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A.
Ionic bonds
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B.
Covalent bonds
-
C.
Metallic bonds
-
D.
Van der Waals forces
Solution
Metallic solids are held together by metallic bonds, which involve a 'sea' of delocalized electrons around positively charged metal ions.
Correct Answer: C — Metallic bonds
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Q. What is the primary force holding together the atoms in metallic solids? (2020)
-
A.
Ionic bonds
-
B.
Covalent bonds
-
C.
Metallic bonds
-
D.
Van der Waals forces
Solution
Metallic solids are held together by metallic bonds, which involve a 'sea of electrons' that are free to move.
Correct Answer: C — Metallic bonds
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Q. What is the primary function of antibiotics? (2020)
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A.
Pain relief
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B.
Bacterial infection treatment
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C.
Viral infection treatment
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D.
Fungal infection treatment
Solution
Antibiotics are primarily used to treat bacterial infections by inhibiting the growth of bacteria.
Correct Answer: B — Bacterial infection treatment
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Q. What is the primary function of antioxidants in food? (2022)
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A.
Enhance flavor
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B.
Preserve color
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C.
Prevent oxidation
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D.
Increase sweetness
Solution
Antioxidants prevent oxidation, which can lead to spoilage and degradation of food quality.
Correct Answer: C — Prevent oxidation
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Q. What is the primary function of antioxidants in the body? (2020)
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A.
Increase energy
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B.
Prevent oxidation
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C.
Enhance digestion
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D.
Boost immunity
Solution
Antioxidants prevent oxidation by neutralizing free radicals, thus protecting cells from damage.
Correct Answer: B — Prevent oxidation
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Q. What is the primary function of antioxidants in the human body? (2020)
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A.
Increase energy
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B.
Prevent oxidation
-
C.
Enhance digestion
-
D.
Boost immunity
Solution
Antioxidants prevent oxidation, which can lead to cellular damage and contribute to various diseases.
Correct Answer: B — Prevent oxidation
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Q. What is the primary function of cholesterol in the body? (2023)
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A.
Energy storage
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B.
Hormone production
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C.
Protein synthesis
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D.
Carbohydrate metabolism
Solution
Cholesterol is essential for the production of hormones, including steroid hormones and vitamin D.
Correct Answer: B — Hormone production
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Q. What is the primary oxidation state of carbon in carbon dioxide (CO2)? (2020)
Solution
In carbon dioxide, carbon has an oxidation state of +4.
Correct Answer: B — +4
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Q. What is the primary oxidation state of iron in FeCl3? (2023)
Solution
In FeCl3, iron (Fe) has a primary oxidation state of +3.
Correct Answer: B — +3
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Q. What is the primary oxidation state of lead in lead(II) oxide (PbO)? (2019)
Solution
In lead(II) oxide, lead has an oxidation state of +2.
Correct Answer: A — +2
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Q. What is the primary oxidation state of nitrogen in ammonia (NH3)? (2021)
Solution
In ammonia, nitrogen has an oxidation state of -3.
Correct Answer: A — -3
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Q. What is the primary oxidation state of nitrogen in nitric acid (HNO3)? (2023)
Solution
In nitric acid, nitrogen has an oxidation state of +5.
Correct Answer: C — +5
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Q. What is the primary product of the electrolysis of water? (2023)
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A.
Hydrogen
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B.
Oxygen
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C.
Hydrogen Peroxide
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D.
Ozone
Solution
The primary products of the electrolysis of water are hydrogen and oxygen gases.
Correct Answer: A — Hydrogen
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Q. What is the primary product of the reaction between hydrogen and chlorine? (2019)
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A.
Hydrochloric acid
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B.
Hydrogen chloride
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C.
Chlorine gas
-
D.
Water
Solution
The primary product of the reaction between hydrogen and chlorine is hydrogen chloride (HCl).
Correct Answer: B — Hydrogen chloride
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Q. What is the primary product of the thermal decomposition of calcium carbonate? (2019)
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A.
Calcium oxide
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B.
Calcium hydroxide
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C.
Calcium bicarbonate
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D.
Calcium chloride
Solution
The thermal decomposition of calcium carbonate (CaCO3) produces calcium oxide (CaO) and carbon dioxide (CO2).
Correct Answer: A — Calcium oxide
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Q. What is the primary product when aluminum reacts with hydrochloric acid? (2020)
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A.
AlCl3
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B.
H2
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C.
Al(OH)3
-
D.
Al2Cl6
Solution
When aluminum reacts with hydrochloric acid, hydrogen gas (H2) is produced along with aluminum chloride (AlCl3).
Correct Answer: B — H2
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Q. What is the primary product when lithium reacts with nitrogen? (2022)
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A.
Lithium nitride
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B.
Lithium oxide
-
C.
Lithium hydroxide
-
D.
Lithium carbonate
Solution
Lithium reacts with nitrogen to form lithium nitride (Li3N).
Correct Answer: A — Lithium nitride
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Q. What is the primary product when potassium permanganate (KMnO4) is reduced in acidic medium? (2019)
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A.
MnO2
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B.
Mn2+
-
C.
MnO4-
-
D.
KMnO4
Solution
In acidic medium, potassium permanganate (KMnO4) is reduced to Mn2+.
Correct Answer: B — Mn2+
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Q. What is the primary source of sulfur dioxide in the atmosphere? (2020)
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A.
Volcanic eruptions
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B.
Automobile emissions
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C.
Industrial processes
-
D.
Natural gas combustion
Solution
Industrial processes, especially those involving the burning of fossil fuels, are the primary source of sulfur dioxide emissions.
Correct Answer: C — Industrial processes
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Q. What is the primary type of bonding in metallic solids? (2020)
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A.
Ionic bonding
-
B.
Covalent bonding
-
C.
Metallic bonding
-
D.
Hydrogen bonding
Solution
Metallic solids are primarily held together by metallic bonding, which involves a 'sea of electrons' that are free to move.
Correct Answer: C — Metallic bonding
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Q. What is the primary use of boron in the industry? (2023)
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A.
Fertilizers
-
B.
Glass production
-
C.
Detergents
-
D.
Pharmaceuticals
Solution
Boron is primarily used in the production of glass and ceramics.
Correct Answer: B — Glass production
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Q. What is the primary use of calcium carbonate? (2019)
-
A.
As a fertilizer
-
B.
In the production of glass
-
C.
As a building material
-
D.
In antacids
Solution
Calcium carbonate is commonly used in antacids to neutralize stomach acid.
Correct Answer: D — In antacids
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Q. What is the primary use of glycerol in the food industry? (2023)
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A.
Sweetener
-
B.
Preservative
-
C.
Thickening agent
-
D.
Flavor enhancer
Solution
Glycerol is commonly used as a sweetener in food products due to its sweet taste and ability to retain moisture.
Correct Answer: A — Sweetener
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Q. What is the primary use of lithium in batteries? (2023)
-
A.
As a conductor
-
B.
As a cathode material
-
C.
As an anode material
-
D.
As an electrolyte
Solution
Lithium is primarily used as an anode material in lithium-ion batteries due to its high electrochemical potential.
Correct Answer: C — As an anode material
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