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Chemistry (NEET)

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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!

Inorganic Chemistry - Block Elements Inorganic Chemistry - Coordination Compounds Inorganic Chemistry - d & f Block Elements Inorganic Chemistry - Hydrogen Inorganic Chemistry - p-Block Elements Inorganic Chemistry - p-Block Elements (Class 12) Organic Chemistry - Alcohols, Phenols & Ethers Organic Chemistry - Aldehydes & Ketones Organic Chemistry - Amines Organic Chemistry - Biomolecules Organic Chemistry - Carboxylic Acids Organic Chemistry - Chemistry in Everyday Life Organic Chemistry - Environmental Chemistry Organic Chemistry - Haloalkanes & Haloarenes Organic Chemistry - Hydrocarbons Organic Chemistry - Organic Chemistry Basics Organic Chemistry - Polymers Physical Chemistry - Atomic Structure Physical Chemistry - Basic Concepts Physical Chemistry - Chemical Kinetics Physical Chemistry - Electrochemistry Physical Chemistry - Equilibrium Physical Chemistry - Redox Reactions Physical Chemistry - Solid State Physical Chemistry - Solutions Physical Chemistry - States of Matter Physical Chemistry - Surface Chemistry Physical Chemistry - Thermodynamics

Q. For a zero-order reaction, how does the concentration of reactants change over time? (2020)

A. Linearly
B. Exponentially
C. Quadratically
D. Logarithmically

Solution

In a zero-order reaction, the concentration of reactants decreases linearly with time.

Correct Answer: A — Linearly

Q. For the equilibrium 2A(g) ⇌ B(g) + C(g), if the volume of the container is decreased, what will happen to the equilibrium? (2020)

A. Shift to the left
B. Shift to the right
C. No change
D. Depends on temperature

Solution

Decreasing the volume increases the pressure, and the equilibrium will shift towards the side with fewer moles of gas, which is the right side in this case.

Correct Answer: B — Shift to the right

Q. For the equilibrium reaction 2SO2(g) + O2(g) ⇌ 2SO3(g), what is the effect of decreasing the volume of the container? (2021)

A. Shift to the left
B. Shift to the right
C. No effect
D. Increase in temperature

Solution

Decreasing the volume increases the pressure, and according to Le Chatelier's principle, the equilibrium will shift towards the side with fewer moles of gas, which is the right side in this case.

Correct Answer: B — Shift to the right

Q. For the equilibrium reaction A ⇌ B, if the concentration of B is increased, what will be the effect on the equilibrium? (2023)

A. Shift to the right
B. Shift to the left
C. No change
D. Increase in temperature

Solution

Increasing the concentration of B will shift the equilibrium to the left to produce more A, according to Le Chatelier's principle.

Correct Answer: B — Shift to the left

Q. For the equilibrium reaction: 2NO2(g) ⇌ N2O4(g), what is the effect of increasing the pressure? (2021)

A. Shift to the left
B. Shift to the right
C. No effect
D. Increase Kp

Solution

Increasing the pressure will shift the equilibrium to the side with fewer moles of gas, which is the right side (N2O4) in this case.

Correct Answer: A — Shift to the left

Q. For the reaction 2SO2(g) + O2(g) ⇌ 2SO3(g), if the volume of the container is decreased, what will happen to the equilibrium? (2021)

A. Shift to the right
B. Shift to the left
C. No change
D. Depends on the temperature

Solution

Decreasing the volume increases the pressure, and the equilibrium will shift towards the side with fewer moles of gas, which is the right side (2 moles of SO3).

Correct Answer: A — Shift to the right

Q. For the reaction 2SO2(g) + O2(g) ⇌ 2SO3(g), what happens if the volume of the container is decreased? (2021)

A. Equilibrium shifts to the left
B. Equilibrium shifts to the right
C. No change
D. Depends on temperature

Solution

Decreasing the volume increases the pressure, and according to Le Chatelier's principle, the equilibrium will shift towards the side with fewer moles of gas, which is the right side in this case.

Correct Answer: B — Equilibrium shifts to the right

Q. For the reaction 2SO2(g) + O2(g) ⇌ 2SO3(g), what is the effect of decreasing the volume? (2021)

A. The equilibrium shifts to the left.
B. The equilibrium shifts to the right.
C. The equilibrium remains unchanged.
D. The reaction stops.

Solution

Decreasing the volume increases the pressure, and according to Le Chatelier's principle, the equilibrium will shift towards the side with fewer moles of gas, which is the right side in this case.

Correct Answer: B — The equilibrium shifts to the right.

Q. For the reaction N2(g) + 3H2(g) ⇌ 2NH3(g), what is the expression for Kp? (2020)

A. (P_NH3)^2 / (P_N2)(P_H2)^3
B. (P_N2)(P_H2)^3 / (P_NH3)^2
C. (P_NH3)^2 / (P_H2)^3
D. (P_N2)(P_H2) / (P_NH3)^2

Solution

Kp is expressed in terms of partial pressures, so for the reaction, Kp = (P_NH3)^2 / (P_N2)(P_H2)^3.

Correct Answer: A — (P_NH3)^2 / (P_N2)(P_H2)^3

Q. For the reaction N2(g) + 3H2(g) ⇌ 2NH3(g), what is the expression for the equilibrium constant Kp? (2020)

A. (P_NH3)^2 / (P_N2)(P_H2)^3
B. (P_N2)(P_H2)^3 / (P_NH3)^2
C. (P_NH3)^2 (P_N2)(P_H2)^3
D. (P_N2)(P_H2)^3 (P_NH3)^2

Solution

Kp is expressed in terms of the partial pressures of the gases involved in the reaction. For this reaction, Kp = (P_NH3)^2 / (P_N2)(P_H2)^3.

Correct Answer: A — (P_NH3)^2 / (P_N2)(P_H2)^3

Q. For the reaction: 2A(g) + B(g) ⇌ 3C(g), if the volume of the container is decreased, what will be the effect on the equilibrium? (2022)

A. Shift to the left
B. Shift to the right
C. No change
D. Increase in temperature

Solution

Decreasing the volume increases the pressure, and the equilibrium will shift towards the side with fewer moles of gas. Here, it shifts to the right, producing more C.

Correct Answer: B — Shift to the right

Q. For the reaction: 2A(g) + B(g) ⇌ 3C(g), what is the correct expression for the equilibrium constant Kc? (2021)

A. [C]^3 / ([A]^2[B])
B. [A]^2[B] / [C]^3
C. [C]^3 / [A]^2
D. [B] / [C]^3

Solution

The equilibrium constant Kc is given by the expression Kc = [C]^3 / ([A]^2[B]), where the concentrations are raised to the power of their coefficients.

Correct Answer: A — [C]^3 / ([A]^2[B])

Q. If 0.5 moles of a non-volatile solute are dissolved in 1 kg of water, what is the expected change in boiling point? (Kb for water = 0.52 °C kg/mol) (2021)

A. 0.26 °C
B. 0.52 °C
C. 1.04 °C
D. 0.78 °C

Solution

Boiling point elevation = i * Kb * m = 1 * 0.52 * 0.5 = 0.26 °C, so change = 0.52 °C.

Correct Answer: C — 1.04 °C

Q. If 0.5 moles of a non-volatile solute are dissolved in 1 kg of water, what is the expected vapor pressure lowering? (2021)

A. 0.5 P0
B. 0.25 P0
C. 0.75 P0
D. 0.1 P0

Solution

Vapor pressure lowering = X_solute * P0 = (0.5 / (0.5 + 55.5)) * P0 ≈ 0.25 P0.

Correct Answer: B — 0.25 P0

Q. If 0.5 moles of a non-volatile solute is dissolved in 1 kg of water, what is the expected vapor pressure lowering? (2020)

A. 0.5 P0
B. 0.25 P0
C. 0.75 P0
D. 0.1 P0

Solution

Vapor pressure lowering = (moles of solute / moles of solvent) * P0 = (0.5 / 55.5) * P0 ≈ 0.25 P0.

Correct Answer: B — 0.25 P0

Q. If 0.5 moles of NaCl is dissolved in 1 liter of water, what is the molality of the solution? (2022)

A. 0.5 m
B. 1 m
C. 2 m
D. 0.25 m

Solution

Molality (m) = moles of solute / kg of solvent. Assuming 1 L of water = 1 kg, molality = 0.5 moles / 1 kg = 0.5 m.

Correct Answer: A — 0.5 m

Q. If 1 kg of water is mixed with 1 kg of sugar, what is the expected change in boiling point? (2023)

A. No change
B. Increase
C. Decrease
D. Depends on the sugar type

Solution

The addition of sugar (a non-volatile solute) will raise the boiling point of water due to boiling point elevation.

Correct Answer: B — Increase

Q. If 1 mole of a non-volatile solute is dissolved in 1 kg of water, what is the expected freezing point depression? (2019)

A. 1.86 °C
B. 3.72 °C
C. 0.93 °C
D. 2.0 °C

Solution

Freezing point depression (ΔTf) = i * Kf * m = 1 * 1.86 °C kg/mol * 1 mol/kg = 1.86 °C.

Correct Answer: A — 1.86 °C

Q. If the equilibrium constant Kc for a reaction is 10, what is the value of Kc for the reverse reaction? (2020)

A. 0.1
B. 10
C. 1
D. 100

Solution

For the reverse reaction, Kc is the reciprocal of the forward reaction. Therefore, Kc (reverse) = 1/Kc (forward) = 1/10 = 0.1.

Correct Answer: A — 0.1

Q. If the freezing point of a solution is -5°C, what is the molality of the solution if the freezing point depression constant (Kf) is 1.86°C kg/mol? (2022)

A. 1.34 m
B. 2.68 m
C. 0.5 m
D. 3.72 m

Solution

ΔTf = Kf * m; -5 = -1.86 * m; m = 5 / 1.86 = 2.68 m.

Correct Answer: B — 2.68 m

Q. If the freezing point of pure water is 0 °C, what will be the freezing point of a solution containing 1 mole of NaCl in 1 kg of water? (2023)

A. -1.86 °C
B. -3.72 °C
C. -2.26 °C
D. -0.93 °C

Solution

Freezing point depression = i * Kf * m = 2 * 1.86 °C kg/mol * 1 mol/kg = 3.72 °C. Thus, freezing point = 0 - 3.72 = -3.72 °C.

Correct Answer: B — -3.72 °C

Q. If the freezing point of pure water is 0°C, what will be the freezing point of a 1 molal solution of NaCl? (2022)

A. -1.86°C
B. -3.72°C
C. -2.52°C
D. -0.52°C

Solution

Freezing point depression = i * Kf * m = 2 * 1.86 * 1 = 3.72°C. Therefore, freezing point = 0 - 3.72 = -1.86°C.

Correct Answer: A — -1.86°C

Q. If the vapor pressure of pure solvent is 100 mmHg, and the vapor pressure of the solution is 80 mmHg, what is the mole fraction of the solute? (2022)

A. 0.2
B. 0.4
C. 0.5
D. 0.8

Solution

Using Raoult's Law: P_solution = X_solvent * P_solvent. X_solvent = P_solution / P_solvent = 80/100 = 0.8, thus X_solute = 1 - X_solvent = 0.2.

Correct Answer: B — 0.4

Q. If the vapor pressure of pure solvent is 100 mmHg, and the vapor pressure of the solution is 80 mmHg, what is the relative lowering of vapor pressure? (2022)

A. 0.2
B. 0.1
C. 0.5
D. 0.3

Solution

Relative lowering of vapor pressure = (P° - P) / P° = (100 - 80) / 100 = 0.2.

Correct Answer: A — 0.2

Q. In a body-centered cubic (BCC) structure, how many atoms are there in one unit cell? (2022)

A. 1
B. 2
C. 4
D. 8

Solution

In a body-centered cubic (BCC) structure, there are 2 atoms per unit cell (1 from the center and 1 from the corners).

Correct Answer: B — 2

Q. In a chemical reaction, what does the term 'activation energy' refer to? (2023)

A. Energy released during the reaction
B. Energy required to initiate the reaction
C. Energy needed to maintain the reaction
D. Energy that is lost

Solution

Activation energy is the minimum energy required to initiate a chemical reaction.

Correct Answer: B — Energy required to initiate the reaction

Q. In a closed system, if a reactant is removed from the equilibrium mixture, what will happen? (2019)

A. Shift to the right
B. Shift to the left
C. No change
D. Increase in temperature

Solution

Removing a reactant will shift the equilibrium to the left to produce more reactants, according to Le Chatelier's principle.

Correct Answer: B — Shift to the left

Q. In a concentration cell, the electrodes are made of: (2020)

A. Different metals
B. Same metal but different concentrations
C. Same metal and same concentration
D. Different electrolytes

Solution

In a concentration cell, the electrodes are made of the same metal but have different concentrations of the electrolyte.

Correct Answer: B — Same metal but different concentrations

Q. In a concentration cell, the two half-cells have: (2019)

A. Different electrodes
B. Same electrodes but different concentrations
C. Same concentrations
D. Different temperatures

Solution

In a concentration cell, the two half-cells have the same electrodes but different concentrations of the electrolyte.

Correct Answer: B — Same electrodes but different concentrations

Q. In a crystal lattice, the arrangement of particles is determined by which of the following? (2019)

A. Temperature
B. Pressure
C. Intermolecular forces
D. All of the above

Solution

The arrangement of particles in a crystal lattice is primarily determined by intermolecular forces, which dictate how particles pack together.

Correct Answer: C — Intermolecular forces

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