Engineering Entrance
Q. Which of the following elements is a halogen? (2017) 2017
A.
Bromine
B.
Barium
C.
Bismuth
D.
Boron
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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
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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
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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
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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
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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
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Solution
Platinum (Pt) is widely known for its catalytic properties in various chemical reactions.
Correct Answer: C — Platinum
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Q. Which of the following elements is most likely to form a covalent bond? (2023)
A.
Sodium
B.
Chlorine
C.
Calcium
D.
Potassium
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Solution
Chlorine (Cl) is a non-metal and is most likely to form covalent bonds.
Correct Answer: B — Chlorine
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Q. Which of the following elements is most likely to form an anion? (2023)
A.
Boron
B.
Carbon
C.
Fluorine
D.
Aluminum
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Solution
Fluorine (F) is highly electronegative and readily forms anions (F-).
Correct Answer: C — Fluorine
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Q. Which of the following elements is most likely to form an ionic bond with sodium? (2020)
A.
Chlorine
B.
Oxygen
C.
Nitrogen
D.
Carbon
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Solution
Chlorine is most likely to form an ionic bond with sodium as it readily accepts an electron to achieve a stable electron configuration.
Correct Answer: A — Chlorine
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Q. Which of the following elements is most likely to form an ionic bond? (2023)
A.
Carbon
B.
Oxygen
C.
Sodium
D.
Nitrogen
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Solution
Sodium is most likely to form an ionic bond as it readily loses an electron to form Na+.
Correct Answer: C — Sodium
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Q. Which of the following elements is most likely to form an ionic bond? (2023) 2023
A.
Carbon
B.
Oxygen
C.
Sodium
D.
Nitrogen
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Solution
Sodium is most likely to form an ionic bond as it readily loses an electron to form Na+.
Correct Answer: C — Sodium
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Q. Which of the following elements is most likely to form covalent bonds? (2023)
A.
Sodium
B.
Magnesium
C.
Chlorine
D.
Aluminum
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Solution
Chlorine (Cl) is a non-metal and tends to form covalent bonds.
Correct Answer: C — Chlorine
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Q. Which of the following elements is not a p-block element? (2022)
A.
Boron
B.
Carbon
C.
Sodium
D.
Nitrogen
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Solution
Sodium is an s-block element, while Boron, Carbon, and Nitrogen are p-block elements.
Correct Answer: C — Sodium
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Q. Which of the following factors does NOT affect the position of equilibrium in a chemical reaction? (2021)
A.
Concentration of reactants
B.
Temperature
C.
Pressure
D.
Nature of the reactants
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Solution
The nature of the reactants does not affect the position of equilibrium. Changes in concentration, temperature, and pressure can shift the equilibrium position according to Le Chatelier's principle.
Correct Answer: D — Nature of the reactants
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Q. Which of the following factors does NOT affect the position of equilibrium? (2023) 2023
A.
Concentration of reactants
B.
Temperature
C.
Pressure
D.
Presence of a catalyst
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Solution
A catalyst speeds up the rate of reaching equilibrium but does not affect the position of equilibrium itself.
Correct Answer: D — Presence of a catalyst
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Q. Which of the following factors does NOT affect the rate of a chemical reaction? (2021) 2021
A.
Concentration of reactants
B.
Temperature
C.
Presence of a catalyst
D.
Color of the reactants
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Solution
The color of the reactants does not affect the rate of a chemical reaction. The other factors directly influence the reaction rate.
Correct Answer: D — Color of the reactants
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Q. Which of the following has the highest bond energy? (2023)
A.
C-H
B.
C-C
C.
C=N
D.
C≡C
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Solution
C≡C (triple bond) has the highest bond energy due to the strong attraction between the two carbon atoms.
Correct Answer: D — C≡C
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Q. Which of the following has the highest ionization energy? (2020) 2020
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Solution
Lithium (Li) has the highest ionization energy among the given options.
Correct Answer: A — Li
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Q. Which of the following has the lowest boiling point? (2023)
A.
H2O
B.
NH3
C.
CH4
D.
HF
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Solution
CH4 (methane) has the lowest boiling point due to weak London dispersion forces compared to the other molecules.
Correct Answer: C — CH4
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Q. Which of the following hydrocarbons is saturated?
A.
C2H2
B.
C3H6
C.
C4H10
D.
C5H8
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Solution
C4H10 (butane) is a saturated hydrocarbon, containing only single bonds.
Correct Answer: C — C4H10
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Q. Which of the following ions has a d5 configuration?
A.
Mn2+
B.
Fe3+
C.
Cr3+
D.
V4+
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Solution
Mn2+ has a d5 configuration as it loses two electrons from its 4s and 3d orbitals.
Correct Answer: A — Mn2+
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Q. Which of the following ions has a stable octet? (2023)
A.
Na+
B.
Cl-
C.
Mg2+
D.
All of the above
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Solution
All of the ions Na+, Cl-, and Mg2+ have achieved a stable octet configuration.
Correct Answer: D — All of the above
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Q. Which of the following is a base unit in the SI system? (2020)
A.
Liter
B.
Meter
C.
Newton
D.
Joule
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Solution
Meter is a base unit in the SI system, while liter, newton, and joule are derived units.
Correct Answer: B — Meter
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Q. Which of the following is a bidentate ligand? (2020) 2020
A.
NH3
B.
EDTA
C.
Cl-
D.
H2O
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Solution
EDTA can form multiple bonds with a metal ion, making it a bidentate ligand as it can attach at two sites.
Correct Answer: B — EDTA
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Q. Which of the following is a carbohydrate? (2023) 2023
A.
Glucose
B.
Amino acid
C.
Fatty acid
D.
Nucleotide
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Solution
Glucose is a simple sugar and a primary carbohydrate.
Correct Answer: A — Glucose
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Q. Which of the following is a carboxylic acid?
A.
C2H5OH
B.
C3H6O
C.
C2H4O2
D.
C3H8
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Solution
C2H4O2 (Acetic acid) is a carboxylic acid.
Correct Answer: C — C2H4O2
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Q. Which of the following is a characteristic of adsorption? (2023)
A.
It is a bulk phenomenon.
B.
It is a surface phenomenon.
C.
It occurs at high temperatures only.
D.
It is always exothermic.
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Solution
Adsorption is a surface phenomenon, as it occurs at the interface between phases.
Correct Answer: B — It is a surface phenomenon.
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Q. Which of the following is a characteristic of elastomers?
A.
Brittle
B.
Rigid
C.
Elastic
D.
Conductive
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Solution
Elastomers are known for their elastic properties, allowing them to stretch and return to their original shape.
Correct Answer: C — Elastic
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Q. Which of the following is a characteristic of unsaturated hydrocarbons?
A.
Only single bonds
B.
Contains double or triple bonds
C.
Higher boiling points
D.
Less reactive
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Solution
Unsaturated hydrocarbons contain double or triple bonds, making them more reactive than saturated hydrocarbons.
Correct Answer: B — Contains double or triple bonds
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Q. Which of the following is a characteristic reaction of phenols? (2021) 2021
A.
Esterification
B.
Nitration
C.
Halogenation
D.
Hydrogenation
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Solution
Phenols undergo halogenation readily due to the electron-donating effect of the hydroxyl group.
Correct Answer: C — Halogenation
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