Q. Which of the following is a characteristic of p-block elements?
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A.
High melting points
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B.
Good conductors of heat
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C.
Varied oxidation states
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D.
Malleable
Solution
P-block elements exhibit varied oxidation states due to their ability to lose or gain electrons.
Correct Answer: C — Varied oxidation states
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Q. Which of the following is a characteristic of s-block elements?
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A.
They have high ionization energies
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B.
They form covalent bonds
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C.
They are good conductors of electricity
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D.
They have low electronegativity
Solution
S-block elements have low electronegativity.
Correct Answer: D — They have low electronegativity
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Q. Which of the following is a characteristic of saturated hydrocarbons?
-
A.
They contain double bonds
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B.
They contain triple bonds
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C.
They are less stable than unsaturated hydrocarbons
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D.
They contain only single bonds
Solution
Saturated hydrocarbons contain only single bonds between carbon atoms.
Correct Answer: D — They contain only single bonds
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Q. Which of the following is a characteristic of solids?
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A.
They can flow
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B.
They have a definite shape
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C.
They are compressible
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D.
They have high kinetic energy
Solution
Solids have a definite shape and are not compressible; they do not flow like liquids or gases.
Correct Answer: B — They have a definite shape
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Q. Which of the following is a characteristic of starch?
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A.
Soluble in water
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B.
Linear structure
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C.
Branched structure
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D.
Sweet taste
Solution
Starch has a branched structure, which allows it to store energy efficiently.
Correct Answer: C — Branched structure
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Q. Which of the following is a characteristic of structural isomers?
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A.
Same connectivity
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B.
Different connectivity
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C.
Same physical properties
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D.
Same optical activity
Solution
Structural isomers have different connectivity of atoms, leading to different compounds.
Correct Answer: B — Different connectivity
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Q. Which of the following is a characteristic of synthetic fibers?
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A.
Biodegradable
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B.
Natural origin
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C.
Durable
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D.
Expensive
Solution
Synthetic fibers are known for their durability and are made from chemical processes, unlike natural fibers.
Correct Answer: C — Durable
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Q. Which of the following is a characteristic of the +I effect?
-
A.
Electron donation
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B.
Electron withdrawal
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C.
Resonance stabilization
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D.
Inductive withdrawal
Solution
The +I effect is characterized by electron donation through the inductive effect.
Correct Answer: A — Electron donation
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Q. Which of the following is a characteristic of the +M effect?
-
A.
Electron withdrawal
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B.
Electron donation
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C.
Increases acidity
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D.
Decreases stability
Solution
+M effect refers to the donation of electron density through resonance.
Correct Answer: B — Electron donation
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Q. Which of the following is a characteristic of the inductive effect?
-
A.
It is a temporary effect.
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B.
It operates through pi bonds.
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C.
It decreases with distance.
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D.
It is stronger than the mesomeric effect.
Solution
The inductive effect decreases with distance from the electronegative atom or group.
Correct Answer: C — It decreases with distance.
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Q. Which of the following is a characteristic of thermoplastic polymers?
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A.
They can be reshaped upon heating
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B.
They are rigid and brittle
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C.
They do not melt
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D.
They are cross-linked
Solution
Thermoplastic polymers can be reshaped upon heating, unlike thermosetting polymers.
Correct Answer: A — They can be reshaped upon heating
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Q. Which of the following is a characteristic of thermosetting polymers?
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A.
They can be remolded upon heating
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B.
They are soluble in organic solvents
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C.
They do not melt upon heating
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D.
They are flexible
Solution
Thermosetting polymers do not melt upon heating; they harden permanently after being set.
Correct Answer: C — They do not melt upon heating
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Q. Which of the following is a characteristic of transition metals?
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A.
They have completely filled d-orbitals.
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B.
They form colored compounds.
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C.
They do not form complexes.
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D.
They have low melting points.
Solution
Transition metals are known for forming colored compounds due to d-d electron transitions.
Correct Answer: B — They form colored compounds.
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Q. Which of the following is a characteristic property of alkaline earth metals?
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A.
They are highly reactive with water
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B.
They form basic oxides
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C.
They have low melting points
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D.
They are gases at room temperature
Solution
Alkaline earth metals typically form basic oxides.
Correct Answer: B — They form basic oxides
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Q. Which of the following is a characteristic property of alkynes?
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A.
Higher boiling points than alkenes
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B.
Lower reactivity than alkenes
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C.
Inability to undergo addition reactions
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D.
Higher density than alkanes
Solution
Alkynes generally have higher boiling points than alkenes due to stronger intermolecular forces.
Correct Answer: A — Higher boiling points than alkenes
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Q. Which of the following is a characteristic property of carboxylic acids?
-
A.
High boiling points
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B.
Low solubility in water
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C.
Sweet smell
-
D.
Basic nature
Solution
Carboxylic acids have high boiling points due to hydrogen bonding.
Correct Answer: A — High boiling points
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Q. Which of the following is a characteristic property of d-block elements?
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A.
High electronegativity
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B.
Formation of colored compounds
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C.
Low melting points
-
D.
Non-conductivity
Solution
D-block elements typically form colored compounds due to d-d electron transitions.
Correct Answer: B — Formation of colored compounds
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Q. Which of the following is a characteristic property of f-block elements?
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A.
High electronegativity
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B.
Formation of colored ions
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C.
Low density
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D.
High ionization energy
Solution
F-block elements typically form colored ions due to the presence of unpaired electrons in f-orbitals.
Correct Answer: B — Formation of colored ions
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Q. Which of the following is a characteristic property of lanthanides?
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A.
High density
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B.
Low melting points
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C.
Non-magnetic
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D.
High ionization energy
Solution
Lanthanides are known for their high density, which is a characteristic property of these elements.
Correct Answer: A — High density
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Q. Which of the following is a characteristic property of p-block elements?
-
A.
High melting points
-
B.
Good conductors of electricity
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C.
Form covalent bonds
-
D.
High density
Solution
P-block elements typically form covalent bonds due to their electronegativity and valence electron configuration.
Correct Answer: C — Form covalent bonds
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Q. Which of the following is a characteristic property of phenols?
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A.
Basicity
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B.
Acidity
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C.
Neutrality
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D.
Inertness
Solution
Phenols are weakly acidic due to the presence of the hydroxyl group attached to the aromatic ring.
Correct Answer: B — Acidity
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Q. Which of the following is a characteristic property of s-block elements?
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A.
Form covalent bonds
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B.
Form ionic bonds
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C.
Have high electronegativity
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D.
Are gases at room temperature
Solution
S-block elements typically form ionic bonds due to their tendency to lose electrons.
Correct Answer: B — Form ionic bonds
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Q. Which of the following is a characteristic property of transition metals?
-
A.
High electronegativity
-
B.
Variable oxidation states
-
C.
Low melting points
-
D.
Non-conductivity
Solution
Transition metals exhibit variable oxidation states due to the involvement of d-orbitals in bonding.
Correct Answer: B — Variable oxidation states
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Q. Which of the following is a characteristic reaction of alcohols?
-
A.
Nitration
-
B.
Esterification
-
C.
Halogenation
-
D.
Oxidation
Solution
Alcohols undergo esterification when they react with carboxylic acids to form esters.
Correct Answer: B — Esterification
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Q. Which of the following is a characteristic reaction of aldehydes?
-
A.
Reduction to alcohols
-
B.
Formation of esters
-
C.
Dehydration
-
D.
Nitration
Solution
Aldehydes can be reduced to alcohols, which is a characteristic reaction of this functional group.
Correct Answer: A — Reduction to alcohols
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Q. Which of the following is a characteristic reaction of alkanes?
-
A.
Nucleophilic substitution
-
B.
Electrophilic addition
-
C.
Free radical halogenation
-
D.
Hydrogenation
Solution
Free radical halogenation is a characteristic reaction of alkanes.
Correct Answer: C — Free radical halogenation
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Q. Which of the following is a characteristic reaction of alkenes?
-
A.
Hydrogenation
-
B.
Hydrolysis
-
C.
Oxidation
-
D.
Reduction
Solution
Alkenes undergo hydrogenation, where they react with hydrogen in the presence of a catalyst.
Correct Answer: A — Hydrogenation
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Q. Which of the following is a characteristic reaction of amines?
-
A.
Nitration
-
B.
Acylation
-
C.
Halogenation
-
D.
Oxidation
Solution
Acylation is a characteristic reaction of amines, where they react with acyl chlorides to form amides.
Correct Answer: B — Acylation
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Q. Which of the following is a characteristic reaction of carboxylic acids?
-
A.
Formation of esters
-
B.
Formation of amides
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C.
Decarboxylation
-
D.
All of the above
Solution
Carboxylic acids can undergo esterification, amide formation, and decarboxylation, making 'All of the above' correct.
Correct Answer: D — All of the above
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Q. Which of the following is a characteristic reaction of ethers?
-
A.
Hydrolysis
-
B.
Oxidation
-
C.
Nucleophilic substitution
-
D.
Dehydration
Solution
Ethers undergo nucleophilic substitution reactions under strong acidic conditions.
Correct Answer: C — Nucleophilic substitution
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