Chemistry (School & UG)
Q. What type of reaction occurs when an alcohol reacts with a carboxylic acid?
A.
Esterification
B.
Hydrolysis
C.
Oxidation
D.
Reduction
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Solution
The reaction between an alcohol and a carboxylic acid produces an ester and water, known as esterification.
Correct Answer: A — Esterification
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Q. What type of reaction occurs when an alkene reacts with bromine?
A.
Hydrolysis
B.
Halogenation
C.
Dehydrogenation
D.
Hydrogenation
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Solution
The reaction of an alkene with bromine is a halogenation reaction, where bromine adds across the double bond.
Correct Answer: B — Halogenation
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Q. What type of reaction occurs when an alkene reacts with HBr?
A.
Addition reaction
B.
Elimination reaction
C.
Substitution reaction
D.
Redox reaction
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Solution
The reaction of an alkene with HBr is an addition reaction, where HBr adds across the double bond.
Correct Answer: A — Addition reaction
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Q. What type of reaction occurs when an amine reacts with a haloalkane?
A.
Nucleophilic substitution
B.
Electrophilic addition
C.
Elimination
D.
Redox
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Solution
The reaction between an amine and a haloalkane is a nucleophilic substitution reaction.
Correct Answer: A — Nucleophilic substitution
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Q. What type of reaction occurs when two amino acids form a dipeptide?
A.
Hydrolysis
B.
Dehydration synthesis
C.
Redox reaction
D.
Substitution reaction
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Solution
Dehydration synthesis occurs when two amino acids join to form a dipeptide, releasing a water molecule.
Correct Answer: B — Dehydration synthesis
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Q. What type of sample preparation is often required for solid samples in IR spectroscopy?
A.
Dissolving in water
B.
KBr pellet formation
C.
Dilution in ethanol
D.
Heating to vaporize
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Solution
Solid samples in IR spectroscopy are often prepared by forming KBr pellets to allow for proper transmission of IR light.
Correct Answer: B — KBr pellet formation
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Q. What type of stereochemistry is observed in an SN2 reaction?
A.
Racemic mixture
B.
Retention of configuration
C.
Inversion of configuration
D.
No stereochemistry change
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Solution
SN2 reactions result in inversion of configuration due to the backside attack of the nucleophile.
Correct Answer: C — Inversion of configuration
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Q. What type of stereochemistry is observed in the product of an E2 elimination reaction?
A.
R/S configuration
B.
Cis/Trans isomerism
C.
Z/E isomerism
D.
Anti-periplanar arrangement
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Solution
E2 elimination reactions require the leaving group and the hydrogen to be in an anti-periplanar arrangement, leading to the formation of the alkene.
Correct Answer: D — Anti-periplanar arrangement
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Q. What type of stereochemistry is observed in the product of an SN2 reaction?
A.
Retention of configuration
B.
Inversion of configuration
C.
Racemization
D.
No stereochemistry change
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Solution
SN2 reactions result in inversion of configuration at the chiral center due to the backside attack of the nucleophile.
Correct Answer: B — Inversion of configuration
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Q. What type of stereochemistry is observed in the product of the reaction between 2-bromobutane and a strong base in an E2 elimination?
A.
R configuration
B.
S configuration
C.
Trans configuration
D.
Cis configuration
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Solution
E2 elimination typically leads to the formation of alkenes with trans stereochemistry due to the anti-periplanar requirement.
Correct Answer: C — Trans configuration
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Q. What type of stereoisomerism is exhibited by 1,2-dibromopropane?
A.
Geometric isomerism
B.
Optical isomerism
C.
Conformational isomerism
D.
No stereoisomerism
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Solution
1,2-Dibromopropane exhibits optical isomerism due to the presence of a chiral center.
Correct Answer: B — Optical isomerism
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Q. What type of stereoisomerism is exhibited by 2-butene?
A.
Geometric isomerism
B.
Optical isomerism
C.
Conformational isomerism
D.
Structural isomerism
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Solution
2-butene exhibits geometric isomerism (cis/trans) due to the restricted rotation around the double bond.
Correct Answer: A — Geometric isomerism
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Q. What type of surface interaction is primarily involved in the adsorption of gases on metals?
A.
Hydrogen bonding
B.
Ionic bonding
C.
Covalent bonding
D.
Van der Waals forces
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Solution
Gases typically adsorb on metal surfaces through weak van der Waals forces, although some may also involve stronger interactions depending on the gas and metal.
Correct Answer: D — Van der Waals forces
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Q. What type of surface interaction is primarily responsible for the adhesion of paint to a wall?
A.
Covalent bonding
B.
Van der Waals forces
C.
Ionic bonding
D.
Hydrogen bonding
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Solution
Van der Waals forces are primarily responsible for the adhesion of paint to a wall, providing weak but significant interactions.
Correct Answer: B — Van der Waals forces
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Q. What type of titration would you use to determine the concentration of a metal ion in a solution?
A.
Redox titration
B.
Complexometric titration
C.
Acid-base titration
D.
Precipitation titration
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Solution
Complexometric titration is often used to determine the concentration of metal ions in a solution by forming a complex with a chelating agent.
Correct Answer: B — Complexometric titration
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Q. What type of transition is primarily observed in the UV region of the spectrum?
A.
Vibrational
B.
Rotational
C.
Electronic
D.
Nuclear
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Solution
The UV region primarily involves electronic transitions, where electrons are excited to higher energy levels.
Correct Answer: C — Electronic
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Q. What type of transition is primarily observed in UV-Vis spectroscopy?
A.
Nuclear spin transitions
B.
Rotational transitions
C.
Electronic transitions
D.
Vibrational transitions
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Solution
UV-Vis spectroscopy primarily observes electronic transitions, where electrons move between different energy levels.
Correct Answer: C — Electronic transitions
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Q. What will happen to the equilibrium position of the reaction N2(g) + 3H2(g) ⇌ 2NH3(g) when the pressure is increased?
A.
Shift to the left
B.
Shift to the right
C.
No change
D.
Depends on temperature
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Solution
Increasing pressure shifts the equilibrium towards the side with fewer moles of gas. Here, the right side has 2 moles (NH3) compared to 4 moles (N2 + 3H2), so the equilibrium shifts to the right.
Correct Answer: B — Shift to the right
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Q. Which acid is commonly used in the leaching process for gold extraction?
A.
Hydrochloric acid
B.
Nitric acid
C.
Sulfuric acid
D.
Cyanide solution
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Solution
Cyanide solution is commonly used in the leaching process for gold extraction.
Correct Answer: D — Cyanide solution
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Q. Which acid is commonly used in the leaching process of gold extraction?
A.
Hydrochloric acid
B.
Nitric acid
C.
Sulfuric acid
D.
Cyanide solution
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Solution
Cyanide solution is used in the leaching process to extract gold from its ore.
Correct Answer: D — Cyanide solution
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Q. Which acid is commonly used in the pickling process of metals?
A.
Sulfuric acid
B.
Hydrochloric acid
C.
Nitric acid
D.
Acetic acid
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Solution
Hydrochloric acid is commonly used in the pickling process to remove rust and scale from metals.
Correct Answer: B — Hydrochloric acid
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Q. Which acid is commonly used in the production of fertilizers?
A.
Phosphoric acid
B.
Sulfuric acid
C.
Nitric acid
D.
Acetic acid
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Solution
Sulfuric acid is used in the production of phosphate fertilizers, which are essential for plant growth.
Correct Answer: B — Sulfuric acid
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Q. Which acid is considered a strong acid in aqueous solution?
A.
Acetic acid
B.
Hydrochloric acid
C.
Citric acid
D.
Carbonic acid
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Solution
Hydrochloric acid (HCl) is a strong acid that completely dissociates in water.
Correct Answer: B — Hydrochloric acid
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Q. Which acid is known as the 'king of chemicals' due to its wide range of applications?
A.
Sulfuric acid
B.
Nitric acid
C.
Hydrochloric acid
D.
Acetic acid
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Solution
Sulfuric acid is often referred to as the 'king of chemicals' because of its extensive use in various industrial processes.
Correct Answer: A — Sulfuric acid
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Q. Which acid is often used in the production of explosives?
A.
Acetic acid
B.
Nitric acid
C.
Sulfuric acid
D.
Hydrochloric acid
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Solution
Nitric acid is a key component in the production of explosives such as TNT and nitroglycerin.
Correct Answer: B — Nitric acid
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Q. Which acid is used in the pickling process of metals?
A.
Hydrochloric acid
B.
Sulfuric acid
C.
Nitric acid
D.
Phosphoric acid
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Solution
Hydrochloric acid is commonly used in the pickling process to remove rust and scale from metals.
Correct Answer: A — Hydrochloric acid
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Q. Which acid is used in the production of lead-acid batteries?
A.
Sulfuric acid
B.
Phosphoric acid
C.
Nitric acid
D.
Acetic acid
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Solution
Sulfuric acid is the electrolyte used in lead-acid batteries.
Correct Answer: A — Sulfuric acid
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Q. Which analytical technique is best suited for determining the concentration of a colored solution?
A.
NMR spectroscopy
B.
UV-Vis spectroscopy
C.
Gas chromatography
D.
Titration
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Solution
UV-Vis spectroscopy is best suited for determining the concentration of a colored solution by measuring the absorbance of light at specific wavelengths.
Correct Answer: B — UV-Vis spectroscopy
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Q. Which analytical technique is best suited for the qualitative analysis of metal ions in solution?
A.
Mass spectrometry
B.
Infrared spectroscopy
C.
Atomic absorption spectroscopy
D.
Nuclear magnetic resonance
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Solution
Atomic absorption spectroscopy is best suited for the qualitative analysis of metal ions, as it allows for the detection of specific metal ions based on their absorption of light.
Correct Answer: C — Atomic absorption spectroscopy
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Q. Which analytical technique is best suited for the separation of anions in a mixture?
A.
Gas chromatography
B.
High-performance liquid chromatography
C.
Thin-layer chromatography
D.
Capillary electrophoresis
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Solution
Capillary electrophoresis is particularly effective for the separation of anions due to its high resolution and speed.
Correct Answer: D — Capillary electrophoresis
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