Q. In the context of surface chemistry, what does the term 'desorption' mean? (2023)
A.
The process of adsorption
B.
The release of adsorbed molecules from a surface
C.
The absorption of a gas into a liquid
D.
The formation of a solid from a gas
Show solution
Solution
Desorption refers to the process where adsorbed molecules are released from the surface back into the gas or liquid phase.
Correct Answer:
B
— The release of adsorbed molecules from a surface
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Q. In the context of surface chemistry, what does the term 'desorption' refer to? (2022)
A.
The process of adsorption
B.
The release of adsorbate from the surface
C.
The formation of a new layer
D.
The increase in surface area
Show solution
Solution
Desorption refers to the process by which an adsorbate is released from the surface of the adsorbent.
Correct Answer:
B
— The release of adsorbate from the surface
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Q. In the context of surface chemistry, what does the term 'surface area' refer to? (2020)
A.
Total area of the solid
B.
Area available for adsorption
C.
Area of the bulk material
D.
Area of the gas
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Solution
In surface chemistry, 'surface area' refers to the area available for adsorption, which is crucial for determining the adsorption capacity.
Correct Answer:
B
— Area available for adsorption
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Q. In the electrochemical cell, what occurs at the anode? (2022)
A.
Reduction
B.
Oxidation
C.
Neutralization
D.
Precipitation
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Solution
At the anode of an electrochemical cell, oxidation occurs, which involves the loss of electrons.
Correct Answer:
B
— Oxidation
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Q. In the electrochemical cell, which electrode is the site of reduction? (2023)
A.
Anode
B.
Cathode
C.
Salt bridge
D.
Electrolyte
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Solution
In an electrochemical cell, the cathode is the electrode where reduction occurs.
Correct Answer:
B
— Cathode
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Q. In the electrochemical series, which element is the best reducing agent? (2022)
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Solution
Li is the best reducing agent among the given alkali metals due to its low ionization energy.
Correct Answer:
A
— Li
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Q. In the electrochemical series, which element is the strongest oxidizing agent? (2023)
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Solution
Fluorine (F2) is the strongest oxidizing agent in the electrochemical series due to its high electronegativity and tendency to gain electrons.
Correct Answer:
B
— F2
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Q. In the electrochemical series, which of the following has the highest reduction potential? (2022)
A.
Li+
B.
Na+
C.
K+
D.
F+
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Solution
Fluorine (F+) has the highest reduction potential in the electrochemical series, indicating it is a strong oxidizing agent.
Correct Answer:
D
— F+
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Q. In the Langmuir adsorption isotherm, which assumption is NOT made? (2019)
A.
Adsorption occurs on a surface with a finite number of identical sites
B.
Adsorption is reversible
C.
There is no interaction between adsorbed molecules
D.
Adsorption occurs only at high pressures
Show solution
Solution
The Langmuir isotherm assumes that adsorption occurs at all pressures, not just high pressures.
Correct Answer:
D
— Adsorption occurs only at high pressures
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Q. In the reaction 2Ag+ + Zn → 2Ag + Zn^2+, which element is oxidized? (2020)
A.
Ag
B.
Zn
C.
O
D.
None of the above
Show solution
Solution
In this reaction, zinc (Zn) is oxidized as it loses electrons to form Zn^2+.
Correct Answer:
B
— Zn
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Q. In the reaction 2Ag⁺ + Zn → 2Ag + Zn²⁺, which species is reduced? (2023)
A.
Ag⁺
B.
Zn
C.
Ag
D.
Zn²⁺
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Solution
In this reaction, Ag⁺ gains electrons to form Ag, thus it is reduced.
Correct Answer:
A
— Ag⁺
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Q. In the reaction 2Fe2O3 + 3C → 4Fe + 3CO2, which species is oxidized? (2019)
A.
Fe2O3
B.
C
C.
Fe
D.
CO2
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Solution
In this reaction, carbon (C) is oxidized as it loses electrons to form CO2.
Correct Answer:
B
— C
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Q. In the reaction 2Fe²⁺ + 2e⁻ → 2Fe, what is being reduced? (2021)
A.
Fe²⁺
B.
Fe
C.
e⁻
D.
None of the above
Show solution
Solution
In this reaction, Fe²⁺ is being reduced as it gains electrons to form Fe.
Correct Answer:
A
— Fe²⁺
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Q. In the reaction 2Fe²⁺ + 2MnO4⁻ → 2Fe³⁺ + 2Mn²⁺, what is the oxidation state change for iron? (2021)
A.
+2 to +3
B.
+3 to +2
C.
0 to +2
D.
−2 to 0
Show solution
Solution
Iron changes its oxidation state from +2 to +3, indicating that it is oxidized.
Correct Answer:
A
— +2 to +3
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Q. In the reaction 2Fe²⁺ + Cl2 → 2Fe³⁺ + 2Cl⁻, what is being oxidized? (2021)
A.
Fe²⁺
B.
Cl2
C.
Fe³⁺
D.
Cl⁻
Show solution
Solution
In this reaction, Fe²⁺ is being oxidized to Fe³⁺ as it loses electrons.
Correct Answer:
A
— Fe²⁺
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Q. In the reaction 2Fe²⁺ + Cl2 → 2Fe³⁺ + 2Cl⁻, which element is oxidized? (2021)
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Solution
Iron (Fe) is oxidized from +2 to +3 oxidation state in this reaction.
Correct Answer:
A
— Fe
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Q. In the reaction 2MnO4- + 5C2O4^2- + 16H+ → 2Mn^2+ + 10CO2 + 8H2O, what is being oxidized? (2019)
A.
MnO4-
B.
C2O4^2-
C.
H+
D.
CO2
Show solution
Solution
C2O4^2- (oxalate ion) is being oxidized to CO2 in this reaction.
Correct Answer:
B
— C2O4^2-
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Q. In the reaction 2MnO4^- + 5C2O4^2- + 6H+ → 2Mn^2+ + 10CO2 + 3H2O, what is the role of MnO4^-? (2023)
A.
Oxidizing agent
B.
Reducing agent
C.
Neutral agent
D.
Catalyst
Show solution
Solution
MnO4^- acts as an oxidizing agent as it gains electrons and is reduced to Mn^2+.
Correct Answer:
A
— Oxidizing agent
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Q. In the reaction 2MnO4⁻ + 5C2O4²⁻ + 16H⁺ → 2Mn²⁺ + 10CO2 + 8H2O, which species is reduced? (2019)
A.
MnO4⁻
B.
C2O4²⁻
C.
H⁺
D.
CO2
Show solution
Solution
In this reaction, MnO4⁻ is reduced to Mn²⁺ as it gains electrons.
Correct Answer:
A
— MnO4⁻
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Q. In the reaction CO(g) + 2H2(g) ⇌ CH3OH(g), if H2 is removed from the system, what will happen to the equilibrium? (2022)
A.
Shift to the right
B.
Shift to the left
C.
No change
D.
Increase in temperature
Show solution
Solution
Removing H2 will shift the equilibrium to the left to produce more H2, according to Le Chatelier's principle.
Correct Answer:
B
— Shift to the left
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Q. In the reaction CO(g) + 2H2(g) ⇌ CH3OH(g), what is the effect of increasing the concentration of CO? (2023)
A.
Shift to the right
B.
Shift to the left
C.
No change
D.
Increase in Kp
Show solution
Solution
Increasing the concentration of CO will shift the equilibrium to the right, favoring the formation of CH3OH.
Correct Answer:
A
— Shift to the right
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Q. In the reaction Zn + Cu²⁺ → Zn²⁺ + Cu, which element is oxidized? (2022)
A.
Zn
B.
Cu²⁺
C.
Zn²⁺
D.
Cu
Show solution
Solution
Zinc (Zn) is oxidized as it loses electrons to form Zn²⁺.
Correct Answer:
A
— Zn
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Q. In thermodynamics, the term 'adiabatic' refers to a process that: (2019)
A.
Occurs at constant temperature
B.
Occurs without heat transfer
C.
Occurs at constant pressure
D.
Occurs at constant volume
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Solution
An adiabatic process is one in which no heat is transferred to or from the system, meaning it occurs without heat exchange.
Correct Answer:
B
— Occurs without heat transfer
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Q. In thermodynamics, the term 'enthalpy' is defined as: (2022)
A.
The total energy of a system
B.
The heat content of a system at constant pressure
C.
The work done by a system
D.
The change in internal energy
Show solution
Solution
Enthalpy is defined as the heat content of a system at constant pressure, represented as H = U + PV.
Correct Answer:
B
— The heat content of a system at constant pressure
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Q. In thermodynamics, the term 'system' refers to: (2022)
A.
The surroundings
B.
The part of the universe under study
C.
The entire universe
D.
None of the above
Show solution
Solution
In thermodynamics, the 'system' refers to the part of the universe that is being studied, while the surroundings are everything else.
Correct Answer:
B
— The part of the universe under study
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Q. In thermodynamics, what does the term 'enthalpy' (H) represent? (2020)
A.
Total energy of the system
B.
Energy required to break bonds
C.
Heat content of the system at constant pressure
D.
Work done by the system
Show solution
Solution
Enthalpy (H) represents the heat content of the system at constant pressure, defined as H = U + PV.
Correct Answer:
C
— Heat content of the system at constant pressure
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Q. In which of the following conditions does the entropy of a system increase? (2022)
A.
When a gas is compressed
B.
When a solid melts
C.
When a liquid freezes
D.
When a gas is cooled
Show solution
Solution
The entropy of a system increases when a solid melts into a liquid, as the disorder of the system increases.
Correct Answer:
B
— When a solid melts
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Q. In which of the following processes is the enthalpy change (ΔH) equal to the heat absorbed at constant pressure? (2019)
A.
Isothermal process
B.
Isochoric process
C.
Isobaric process
D.
Adiabatic process
Show solution
Solution
In an isobaric process, the enthalpy change (ΔH) is equal to the heat absorbed or released at constant pressure.
Correct Answer:
C
— Isobaric process
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Q. In which of the following processes is the enthalpy change equal to the heat absorbed by the system at constant pressure? (2019)
A.
Isothermal process
B.
Isochoric process
C.
Isobaric process
D.
Adiabatic process
Show solution
Solution
In an isobaric process, the enthalpy change is equal to the heat absorbed by the system at constant pressure.
Correct Answer:
C
— Isobaric process
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Q. In which state of matter do particles have the strongest intermolecular forces? (2023)
A.
Gas
B.
Liquid
C.
Solid
D.
Plasma
Show solution
Solution
In solids, particles are held together by strong intermolecular forces, giving them a definite shape and volume.
Correct Answer:
C
— Solid
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Showing 61 to 90 of 626 (21 Pages)
Chemistry (NEET) MCQ & Objective Questions
Chemistry is a crucial subject for students preparing for NEET and other competitive exams in India. Mastering Chemistry (NEET) is essential not only for scoring well but also for building a strong foundation in scientific concepts. Practicing MCQs and objective questions can significantly enhance your exam preparation, allowing you to tackle important questions with confidence.
What You Will Practise Here
Fundamental concepts of Physical Chemistry
Organic Chemistry reactions and mechanisms
Inorganic Chemistry periodic table trends
Stoichiometry and chemical calculations
Equilibrium and thermodynamics principles
Important definitions and key formulas
Diagrams related to chemical structures and reactions
Exam Relevance
Chemistry is a significant part of the syllabus for CBSE, State Boards, NEET, and JEE. In these exams, questions often focus on conceptual understanding and application of theories. You can expect a mix of direct questions, application-based problems, and conceptual MCQs that test your knowledge of key topics. Familiarity with common question patterns will help you navigate the exam more effectively.
Common Mistakes Students Make
Overlooking the importance of units in calculations
Confusing similar concepts in Organic Chemistry
Neglecting to balance chemical equations correctly
Misinterpreting questions that involve multiple steps
Failing to memorize essential definitions and formulas
FAQs
Question: What are the best ways to prepare for Chemistry (NEET) MCQs?Answer: Regular practice of MCQs, understanding core concepts, and revising key formulas are effective strategies.
Question: How can I improve my speed in solving Chemistry (NEET) objective questions?Answer: Time yourself while practicing and focus on familiarizing yourself with common question types.
Start solving practice MCQs today to test your understanding and boost your confidence in Chemistry (NEET). Remember, consistent practice is the key to success!
