Physical Chemistry

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Q. For the reaction A(g) + B(g) ⇌ C(g), if the pressure is decreased, what will happen to the equilibrium?
  • A. Shift to the right
  • B. Shift to the left
  • C. No change
  • D. Reaction stops
Q. For the reaction CO(g) + 2H2(g) ⇌ CH3OH(g), if the pressure is increased, what will be the effect on the equilibrium position?
  • A. Shift to the left
  • B. Shift to the right
  • C. No effect
  • D. Depends on temperature
Q. For the reaction CO(g) + 2H2(g) ⇌ CH3OH(g), what happens if H2 is removed from the system?
  • A. Equilibrium shifts to the right
  • B. Equilibrium shifts to the left
  • C. No change occurs
  • D. Reaction stops
Q. For the reaction H2(g) + I2(g) ⇌ 2HI(g), if the temperature is increased and Kc decreases, what does this indicate about the reaction?
  • A. Exothermic
  • B. Endothermic
  • C. Reversible
  • D. Irreversible
Q. For the reaction N2(g) + 3H2(g) ⇌ 2NH3(g), what happens if H2 is removed from the system?
  • A. Equilibrium shifts to the right
  • B. Equilibrium shifts to the left
  • C. No change occurs
  • D. NH3 concentration increases
Q. For the reaction N2(g) + 3H2(g) ⇌ 2NH3(g), what happens if the concentration of NH3 is decreased?
  • A. Equilibrium shifts to the right
  • B. Equilibrium shifts to the left
  • C. No change
  • D. Reaction stops
Q. For the reaction N2(g) + 3H2(g) ⇌ 2NH3(g), what is the effect of decreasing the volume of the container?
  • A. Shifts equilibrium to the right
  • B. Shifts equilibrium to the left
  • C. No effect on equilibrium
  • D. Increases the concentration of NH3
Q. For the reaction N2(g) + 3H2(g) ⇌ 2NH3(g), what will happen if H2 is removed?
  • A. Shift to the right
  • B. Shift to the left
  • C. No change
  • D. Reaction stops
Q. For the reaction N2(g) + 3H2(g) ⇌ 2NH3(g), what will happen if NH3 is removed from the system?
  • A. Shift to the right
  • B. Shift to the left
  • C. No change
  • D. Reaction stops
Q. For the reaction N2(g) + 3H2(g) ⇌ 2NH3(g), what will happen if the concentration of NH3 is decreased?
  • A. Shifts to the right
  • B. Shifts to the left
  • C. No effect
  • D. Reaction stops
Q. How does dilution affect a reaction at equilibrium involving aqueous solutions?
  • A. Shifts equilibrium to the right
  • B. Shifts equilibrium to the left
  • C. No effect on equilibrium
  • D. Increases the rate of reaction
Q. How does increasing temperature affect an exothermic reaction at equilibrium?
  • A. Shifts equilibrium to the right
  • B. Shifts equilibrium to the left
  • C. No effect on equilibrium
  • D. Increases the rate of reaction
Q. How does increasing temperature affect the enthalpy of a substance?
  • A. It decreases enthalpy.
  • B. It increases enthalpy.
  • C. It has no effect.
  • D. It depends on the substance.
Q. How does increasing temperature generally affect the enthalpy of a system?
  • A. It decreases the enthalpy
  • B. It has no effect on enthalpy
  • C. It increases the enthalpy
  • D. It depends on the type of reaction
Q. How does increasing the temperature affect the equilibrium constant (K) of an endothermic reaction?
  • A. K decreases
  • B. K increases
  • C. K remains constant
  • D. K becomes zero
Q. How does the addition of an inert gas at constant volume affect the equilibrium of a reaction?
  • A. Shifts equilibrium to the right
  • B. Shifts equilibrium to the left
  • C. No effect on equilibrium
  • D. Increases the reaction rate
Q. If a catalyst is added to the reaction A + B ⇌ C + D, what is the effect on the equilibrium position?
  • A. Shift to the left
  • B. Shift to the right
  • C. No change
  • D. Increase the rate of reaction
Q. If a reaction at equilibrium is disturbed by removing a product, what will occur?
  • A. Equilibrium shifts to the right
  • B. Equilibrium shifts to the left
  • C. No change in equilibrium position
  • D. Reaction stops
Q. If a reaction is at equilibrium and the volume of the container is decreased, what will happen?
  • A. Shift to the side with more moles of gas
  • B. Shift to the side with fewer moles of gas
  • C. No effect
  • D. Reaction stops
Q. If a system at equilibrium is disturbed by adding a product, what is the expected outcome?
  • A. Shifts to the right
  • B. Shifts to the left
  • C. No effect
  • D. Increases the reaction rate
Q. If the activation energy of a reaction is 50 kJ/mol, what is the effect of increasing the temperature from 300 K to 350 K on the rate constant?
  • A. Rate constant decreases
  • B. Rate constant remains the same
  • C. Rate constant increases
  • D. Rate constant doubles
Q. If the atomic radius of chlorine is 99 pm, what is the atomic radius of potassium in pm?
  • A. 227 pm
  • B. 196 pm
  • C. 186 pm
  • D. 210 pm
Q. If the bond length of a C-C bond is 1.54 Å, what is the bond energy in kJ/mol if the bond order is 1?
  • A. 348
  • B. 612
  • C. 436
  • D. 298
Q. If the concentration of a reactant is halved in a first-order reaction, what happens to the rate?
  • A. Rate is halved
  • B. Rate is doubled
  • C. Rate remains the same
  • D. Rate is quartered
Q. If the concentration of Cu²⁺ in a cell is 0.01 M and the standard reduction potential is +0.34 V, what is the cell potential at 25°C using the Nernst equation?
  • A. 0.34 V
  • B. 0.30 V
  • C. 0.28 V
  • D. 0.25 V
Q. If the concentration of reactants in a redox reaction is doubled, how does it affect the cell potential according to the Nernst equation?
  • A. Increases
  • B. Decreases
  • C. Remains the same
  • D. Depends on temperature
Q. If the enthalpy change (ΔH) for a reaction is -150 kJ and the reaction occurs at constant pressure, how much heat is released when 3 moles of reactants are consumed?
  • A. 50 kJ
  • B. 150 kJ
  • C. 450 kJ
  • D. 300 kJ
Q. If the enthalpy change for a reaction is +75 kJ for 2 moles, what is the enthalpy change per mole?
  • A. 37.5 kJ
  • B. 75 kJ
  • C. 150 kJ
  • D. 25 kJ
Q. If the enthalpy change for a reaction is -500 kJ for 5 moles, what is the enthalpy change for 1 mole?
  • A. 100 kJ
  • B. 500 kJ
  • C. 200 kJ
  • D. 50 kJ
Q. If the enthalpy of formation of CO2(g) is -393.5 kJ/mol, what is the enthalpy change for the combustion of 1 mole of carbon?
  • A. -393.5 kJ
  • B. 393.5 kJ
  • C. 0 kJ
  • D. 786.0 kJ
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