Chemistry

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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+
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
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
Q. In the reaction 2Ag⁺ + Zn → 2Ag + Zn²⁺, which species is reduced? (2023)
  • A. Ag⁺
  • B. Zn
  • C. Ag
  • D. Zn²⁺
Q. In the reaction 2Fe2O3 + 3C → 4Fe + 3CO2, which species is oxidized? (2019)
  • A. Fe2O3
  • B. C
  • C. Fe
  • D. CO2
Q. In the reaction 2Fe²⁺ + 2e⁻ → 2Fe, what is being reduced? (2021)
  • A. Fe²⁺
  • B. Fe
  • C. e⁻
  • D. None of the above
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
Q. In the reaction 2Fe²⁺ + Cl2 → 2Fe³⁺ + 2Cl⁻, what is being oxidized? (2021)
  • A. Fe²⁺
  • B. Cl2
  • C. Fe³⁺
  • D. Cl⁻
Q. In the reaction 2Fe²⁺ + Cl2 → 2Fe³⁺ + 2Cl⁻, which element is oxidized? (2021)
  • A. Fe
  • B. Cl
  • C. O
  • D. None
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
Q. In the reaction 2MnO4⁻ + 5C2O4²⁻ + 16H⁺ → 2Mn²⁺ + 10CO2 + 8H2O, which species is reduced? (2019)
  • A. MnO4⁻
  • B. C2O4²⁻
  • C. H⁺
  • D. CO2
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
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
Q. In the reaction Zn + Cu²⁺ → Zn²⁺ + Cu, which element is oxidized? (2022)
  • A. Zn
  • B. Cu²⁺
  • C. Zn²⁺
  • D. Cu
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
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
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
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
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
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
Q. In which state of matter do particles have the strongest intermolecular forces? (2023)
  • A. Gas
  • B. Liquid
  • C. Solid
  • D. Plasma
Q. In which type of solid are the constituent particles held together by covalent bonds? (2022)
  • A. Ionic solids
  • B. Covalent network solids
  • C. Metallic solids
  • D. Molecular solids
Q. In which type of solid are the constituent particles held together by van der Waals forces? (2022)
  • A. Ionic solids
  • B. Covalent solids
  • C. Metallic solids
  • D. Molecular solids
Q. The electrochemical series is a list of elements arranged according to their: (2022)
  • A. Atomic mass
  • B. Electronegativity
  • C. Standard electrode potentials
  • D. Ionization energy
Q. The electrochemical series is a list of: (2023)
  • A. Reactions
  • B. Electrodes arranged by standard electrode potential
  • C. Ionic compounds
  • D. Gases
Q. The entropy of a perfect crystalline substance at absolute zero is given by: (2021)
  • A. 0 J/K
  • B. 1 J/K
  • C. 2 J/K
  • D. Depends on the substance
Q. The equilibrium constant for the reaction 2SO2(g) + O2(g) ⇌ 2SO3(g) is 4. What is the value of Kp? (2023)
  • A. 4
  • B. 16
  • C. 0.25
  • D. 0.0625
Q. The Faraday's first law of electrolysis states that: (2018)
  • A. The mass of substance deposited is directly proportional to the current
  • B. The voltage is directly proportional to the current
  • C. The energy is conserved
  • D. The temperature remains constant
Q. The Freundlich adsorption isotherm is best described by which equation? (2023)
  • A. x/m = kP
  • B. x/m = kP^(1/n)
  • C. P = k(x/m)
  • D. P = k(x/m)^(1/n)
Q. The half-life of a first-order reaction is independent of the initial concentration of the reactant. What is the expression for the half-life? (2022)
  • A. t₁/₂ = 0.693/k
  • B. t₁/₂ = k/0.693
  • C. t₁/₂ = 1/k
  • D. t₁/₂ = k/1
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