Q. What is the primary use of chlorine in water treatment?
-
A.
To increase pH
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B.
To remove hardness
-
C.
As a disinfectant
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D.
To add minerals
Solution
Chlorine is primarily used as a disinfectant in water treatment.
Correct Answer: C — As a disinfectant
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Q. What is the primary use of citric acid in food?
-
A.
Preservative
-
B.
Flavor enhancer
-
C.
Thickener
-
D.
Coloring agent
Solution
Citric acid is commonly used as a flavor enhancer in food products.
Correct Answer: B — Flavor enhancer
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Q. What is the primary use of ethanol in everyday life?
-
A.
Fuel
-
B.
Solvent
-
C.
Antiseptic
-
D.
All of the above
Solution
Ethanol is used as a fuel, solvent, and antiseptic in various applications.
Correct Answer: D — All of the above
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Q. What is the primary use of hydrogen in the industry?
-
A.
Fertilizers
-
B.
Fuel cells
-
C.
Plastics
-
D.
Glass production
Solution
Hydrogen is primarily used in fuel cells for energy production.
Correct Answer: B — Fuel cells
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Q. What is the primary use of potassium in agriculture?
-
A.
Fertilizer
-
B.
Pesticide
-
C.
Herbicide
-
D.
Soil conditioner
Solution
Potassium is primarily used as a fertilizer in agriculture.
Correct Answer: A — Fertilizer
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Q. What is the primary use of silicon in the industry?
-
A.
Fertilizers
-
B.
Semiconductors
-
C.
Glass production
-
D.
Alloys
Solution
Silicon is primarily used in the semiconductor industry.
Correct Answer: B — Semiconductors
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Q. What is the primary use of sodium bicarbonate in households?
-
A.
Cleaning agent
-
B.
Food preservative
-
C.
Antacid
-
D.
All of the above
Solution
Sodium bicarbonate is used for cleaning, as a food preservative, and as an antacid.
Correct Answer: D — All of the above
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Q. What is the primary use of sodium bicarbonate?
-
A.
Baking
-
B.
Medicine
-
C.
Cleaning
-
D.
All of the above
Solution
Sodium bicarbonate is used in baking, medicine, and cleaning.
Correct Answer: D — All of the above
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Q. What is the primary use of Teflon?
-
A.
Insulation
-
B.
Non-stick coatings
-
C.
Adhesives
-
D.
Textiles
Solution
Teflon is primarily used for non-stick coatings in cookware due to its low friction properties.
Correct Answer: B — Non-stick coatings
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Q. What is the principal quantum number for an electron in the 5d subshell?
Solution
The principal quantum number n for the 5d subshell is 5.
Correct Answer: C — 5
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Q. What is the principal quantum number for an electron in the ground state of a hydrogen atom?
Solution
The ground state of a hydrogen atom corresponds to n=1.
Correct Answer: B — 1
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Q. What is the principal quantum number of the outermost electron in chlorine?
Solution
Chlorine has an atomic number of 17, and its outermost electrons are in the n=3 shell.
Correct Answer: B — 3
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Q. What is the principal quantum number of the outermost electron in potassium (K)?
Solution
Potassium has the electronic configuration [Ar] 4s1, so the principal quantum number of the outermost electron is 4.
Correct Answer: A — 3
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Q. What is the principal quantum number of the valence electrons in chlorine?
Solution
Chlorine has an atomic number of 17, and its valence electrons are in the n=3 shell.
Correct Answer: B — 3
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Q. What is the principle behind the law of conservation of mass?
-
A.
Mass can be created
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B.
Mass can be destroyed
-
C.
Mass is constant in chemical reactions
-
D.
Mass is variable in reactions
Solution
The law of conservation of mass states that mass is neither created nor destroyed in a chemical reaction.
Correct Answer: C — Mass is constant in chemical reactions
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Q. What is the process called when a polymer is formed by the addition of monomers without the loss of any small molecules?
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A.
Condensation polymerization
-
B.
Addition polymerization
-
C.
Cross-linking
-
D.
Chain termination
Solution
Addition polymerization is the process where monomers add together without the loss of small molecules.
Correct Answer: B — Addition polymerization
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Q. What is the process called when a polymer is formed by the elimination of a small molecule?
-
A.
Addition polymerization
-
B.
Condensation polymerization
-
C.
Chain-growth polymerization
-
D.
Step-growth polymerization
Solution
Condensation polymerization is the process where a polymer is formed by the elimination of a small molecule.
Correct Answer: B — Condensation polymerization
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Q. What is the process called when a solid changes directly into a gas?
-
A.
Sublimation
-
B.
Evaporation
-
C.
Condensation
-
D.
Deposition
Solution
Sublimation is the process where a solid changes directly into a gas without passing through the liquid state.
Correct Answer: A — Sublimation
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Q. What is the process of creating a polymer from monomers called?
-
A.
Polymerization
-
B.
Depolymerization
-
C.
Sublimation
-
D.
Condensation
Solution
The process of creating a polymer from monomers is called polymerization.
Correct Answer: A — Polymerization
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Q. What is the product formed when Fe2O3 is reduced by carbon monoxide?
Solution
The product formed is Fe (iron) when Fe2O3 is reduced by carbon monoxide.
Correct Answer: A — Fe
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Q. What is the product of the complete combustion of an alkane?
-
A.
Carbon monoxide and water
-
B.
Carbon dioxide and water
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C.
Carbon and hydrogen
-
D.
Hydrogen gas
Solution
The complete combustion of an alkane produces carbon dioxide and water.
Correct Answer: B — Carbon dioxide and water
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Q. What is the product of the complete combustion of an alkyne?
-
A.
CO2 and H2O
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B.
CO and H2O
-
C.
C and H2O
-
D.
C2H4
Solution
The complete combustion of an alkyne produces carbon dioxide (CO2) and water (H2O).
Correct Answer: A — CO2 and H2O
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Q. What is the product of the complete combustion of propane (C3H8)?
-
A.
CO2 and H2O
-
B.
CO and H2O
-
C.
C and H2O
-
D.
C2H4 and H2O
Solution
The complete combustion of propane produces carbon dioxide (CO2) and water (H2O).
Correct Answer: A — CO2 and H2O
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Q. What is the product of the complete hydrogenation of 2-butyne?
-
A.
1-butyne
-
B.
2-butyne
-
C.
butane
-
D.
butyne
Solution
The complete hydrogenation of 2-butyne results in butane.
Correct Answer: C — butane
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Q. What is the product of the decarboxylation of sodium acetate?
-
A.
Methane
-
B.
Ethane
-
C.
Carbon dioxide
-
D.
Acetic acid
Solution
Decarboxylation of sodium acetate produces methane.
Correct Answer: A — Methane
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Q. What is the product of the dehydration of 2-butanol?
-
A.
Butene
-
B.
Butyne
-
C.
Butadiene
-
D.
Butanol
Solution
Dehydration of 2-butanol leads to the formation of butene as the major product.
Correct Answer: A — Butene
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Q. What is the product of the dehydration of ethanol?
-
A.
Ethylene
-
B.
Acetaldehyde
-
C.
Diethyl ether
-
D.
Acetic acid
Solution
Dehydration of ethanol leads to the formation of ethylene (ethene) by elimination of water.
Correct Answer: A — Ethylene
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Q. What is the product of the esterification reaction between acetic acid and ethanol?
-
A.
Ethyl acetate
-
B.
Acetic anhydride
-
C.
Ethanol acetate
-
D.
Acetic acid
Solution
The reaction between acetic acid and ethanol produces ethyl acetate.
Correct Answer: A — Ethyl acetate
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Q. What is the product of the hydration of ethene in the presence of sulfuric acid?
-
A.
Ethanol
-
B.
Ethane
-
C.
Acetic acid
-
D.
Butanol
Solution
The hydration of ethene in the presence of sulfuric acid produces ethanol.
Correct Answer: A — Ethanol
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Q. What is the product of the hydrolysis of 1-chloropropane in the presence of water?
-
A.
Propane
-
B.
Propan-1-ol
-
C.
Propan-2-ol
-
D.
Chloropropane
Solution
The hydrolysis of 1-chloropropane in the presence of water yields propan-1-ol as the main product.
Correct Answer: B — Propan-1-ol
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