Q. Which of the following changes will NOT affect the position of equilibrium in a chemical reaction?
-
A.
Changing the concentration of reactants
-
B.
Changing the temperature
-
C.
Adding a catalyst
-
D.
Changing the pressure
Solution
Adding a catalyst speeds up the rate of both the forward and reverse reactions equally, thus it does not affect the position of equilibrium.
Correct Answer: C — Adding a catalyst
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Q. Which of the following changes will shift the equilibrium to the right in the reaction: N2(g) + 3H2(g) ⇌ 2NH3(g)? (2021)
-
A.
Increasing the concentration of N2
-
B.
Decreasing the temperature
-
C.
Increasing the pressure
-
D.
Adding a catalyst
Solution
Increasing the pressure will shift the equilibrium to the side with fewer moles of gas, which is the right side (2 moles of NH3) in this case.
Correct Answer: C — Increasing the pressure
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Q. Which of the following complexes exhibits geometrical isomerism? (2022) 2022
-
A.
[CoCl2(NH3)4]+
-
B.
[Ni(CO)4]
-
C.
[CuCl2(NH3)2]
-
D.
[Zn(NH3)4]2+
Solution
[CoCl2(NH3)4]+ can exhibit geometrical isomerism due to the different arrangements of ligands around the cobalt ion.
Correct Answer: A — [CoCl2(NH3)4]+
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Q. Which of the following complexes is paramagnetic? (2023) 2023
-
A.
[Ni(CN)4]2-
-
B.
[Fe(H2O)6]3+
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C.
[Cu(NH3)4]2+
-
D.
[Zn(NH3)4]2+
Solution
[Fe(H2O)6]3+ has unpaired electrons, making it paramagnetic, while the others have all paired electrons.
Correct Answer: B — [Fe(H2O)6]3+
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Q. Which of the following compounds contains a double bond? (2023)
-
A.
H2O
-
B.
CO2
-
C.
NH3
-
D.
CH4
Solution
Carbon dioxide (CO2) contains double bonds between carbon and oxygen.
Correct Answer: B — CO2
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Q. Which of the following compounds contains a p-block element? (2022) 2022
-
A.
NaCl
-
B.
MgO
-
C.
SiO2
-
D.
Fe2O3
Solution
Silicon dioxide (SiO2) contains silicon, which is a p-block element.
Correct Answer: C — SiO2
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Q. Which of the following compounds has a dipole moment? (2023)
-
A.
CO2
-
B.
CH4
-
C.
HCl
-
D.
CCl4
Solution
HCl has a dipole moment because it is a polar molecule with a significant difference in electronegativity between hydrogen and chlorine.
Correct Answer: C — HCl
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Q. Which of the following compounds is a ketone? (2023) 2023
-
A.
Propanal
-
B.
Butanone
-
C.
Benzaldehyde
-
D.
Ethanal
Solution
Butanone is a ketone, characterized by having the carbonyl group (C=O) between two carbon atoms.
Correct Answer: B — Butanone
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Q. Which of the following compounds is a primary haloalkane?
-
A.
CH3CH2CH2Cl
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B.
CH3Cl
-
C.
C2H5CCl3
-
D.
C6H5Cl
Solution
CH3CH2CH2Cl is a primary haloalkane as the carbon attached to the halogen is bonded to only one other carbon.
Correct Answer: A — CH3CH2CH2Cl
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Q. Which of the following compounds is a product of the reaction between an aldehyde and a Grignard reagent?
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A.
Alcohol
-
B.
Ketone
-
C.
Carboxylic acid
-
D.
Ester
Solution
The reaction of an aldehyde with a Grignard reagent produces a primary alcohol.
Correct Answer: A — Alcohol
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Q. Which of the following compounds is an example of a base? (2019)
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A.
HCl
-
B.
NaOH
-
C.
H2SO4
-
D.
NH4Cl
Solution
Sodium hydroxide (NaOH) is a strong base.
Correct Answer: B — NaOH
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Q. Which of the following compounds is an example of a p-block element compound? (2020)
-
A.
NaCl
-
B.
MgO
-
C.
AlCl3
-
D.
CaF2
Solution
AlCl3 is a compound formed from a p-block element (Aluminum) and is a classic example of p-block chemistry.
Correct Answer: C — AlCl3
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Q. Which of the following compounds is an example of an aromatic hydrocarbon? (2023)
-
A.
Cyclohexane
-
B.
Benzene
-
C.
Ethylene
-
D.
Propane
Solution
Benzene is an aromatic hydrocarbon characterized by its stable ring structure and delocalized electrons.
Correct Answer: B — Benzene
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Q. Which of the following compounds is an isomer of butanol?
-
A.
2-Butanol
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B.
1-Butanol
-
C.
Butyric acid
-
D.
Butene
Solution
2-Butanol is an isomer of butanol, differing in the position of the hydroxyl group.
Correct Answer: A — 2-Butanol
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Q. Which of the following compounds is an unsaturated hydrocarbon? (2023)
-
A.
C2H6
-
B.
C3H8
-
C.
C2H4
-
D.
C4H10
Solution
C2H4 (ethylene) is an unsaturated hydrocarbon as it contains a double bond.
Correct Answer: C — C2H4
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Q. Which of the following compounds is covalent? (2019)
-
A.
NaCl
-
B.
MgO
-
C.
H2O
-
D.
CaO
Solution
H2O is a covalent compound formed by the sharing of electrons between hydrogen and oxygen atoms.
Correct Answer: C — H2O
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Q. Which of the following compounds is not an alcohol? (2023)
-
A.
Ethanol
-
B.
Methanol
-
C.
Phenol
-
D.
Isopropanol
Solution
Phenol is not classified as an alcohol because it has an aromatic ring, while the others are aliphatic alcohols.
Correct Answer: C — Phenol
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Q. Which of the following compounds is not an alcohol? (2023) 2023
-
A.
Ethanol
-
B.
Methanol
-
C.
Phenol
-
D.
Isopropanol
Solution
Phenol is not classified as an alcohol because it has an aromatic ring, while the others are aliphatic alcohols.
Correct Answer: C — Phenol
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Q. Which of the following correctly describes the relationship between gravitational force and distance?
-
A.
Directly proportional
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B.
Inversely proportional
-
C.
Exponential
-
D.
Linear
Solution
Gravitational force is inversely proportional to the square of the distance between the centers of two masses.
Correct Answer: B — Inversely proportional
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Q. Which of the following d-block elements is a good conductor of electricity?
-
A.
Copper
-
B.
Zinc
-
C.
Cadmium
-
D.
Mercury
Solution
Copper (Cu) is known for its excellent electrical conductivity.
Correct Answer: A — Copper
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Q. Which of the following d-block elements is used in making alloys?
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A.
Gold
-
B.
Silver
-
C.
Nickel
-
D.
Lead
Solution
Nickel (Ni) is commonly used in making various alloys due to its strength and corrosion resistance.
Correct Answer: C — Nickel
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Q. Which of the following elements can form a triple bond? (2022)
-
A.
Oxygen
-
B.
Nitrogen
-
C.
Carbon
-
D.
Hydrogen
Solution
Nitrogen can form a triple bond, as seen in N2, where three pairs of electrons are shared between the two nitrogen atoms.
Correct Answer: B — Nitrogen
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Q. Which of the following elements has the electronic configuration [Ne]3s²? (2016)
-
A.
Sodium
-
B.
Magnesium
-
C.
Aluminum
-
D.
Silicon
Solution
Magnesium has the electronic configuration [Ne]3s².
Correct Answer: B — Magnesium
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Q. Which of the following elements is a f-block element?
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A.
Uranium
-
B.
Titanium
-
C.
Zinc
-
D.
Copper
Solution
Uranium is an f-block element as it is part of the actinides series.
Correct Answer: A — Uranium
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Q. Which of the following elements is a halogen? (2017) 2017
-
A.
Bromine
-
B.
Barium
-
C.
Bismuth
-
D.
Boron
Solution
Bromine is a halogen, located in group 17 of the periodic table.
Correct Answer: A — Bromine
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Q. Which of the following elements is a metalloid in the p-block? (2022) 2022
-
A.
Boron
-
B.
Aluminium
-
C.
Gallium
-
D.
Indium
Solution
Boron is classified as a metalloid in the p-block elements.
Correct Answer: A — Boron
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Q. Which of the following elements is a noble gas? (2021) 2021
-
A.
Oxygen
-
B.
Nitrogen
-
C.
Neon
-
D.
Hydrogen
Solution
Neon is a noble gas, which is characterized by its lack of reactivity.
Correct Answer: C — Neon
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Q. Which of the following elements is a p-block element? (2021) 2021
-
A.
Sodium
-
B.
Calcium
-
C.
Aluminium
-
D.
Iron
Solution
Aluminium (Al) is in group 13 of the periodic table, which is classified as a p-block element.
Correct Answer: C — Aluminium
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Q. Which of the following elements is known for forming complex ions?
-
A.
Calcium
-
B.
Copper
-
C.
Sodium
-
D.
Magnesium
Solution
Copper (Cu) is known for forming complex ions due to its ability to coordinate with ligands.
Correct Answer: B — Copper
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Q. Which of the following elements is known for its catalytic properties?
-
A.
Copper
-
B.
Iron
-
C.
Platinum
-
D.
Zinc
Solution
Platinum (Pt) is widely known for its catalytic properties in various chemical reactions.
Correct Answer: C — Platinum
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