Physical Chemistry

Q. What is the relationship between the equilibrium constant (K) and the Gibbs free energy change (ΔG) for a reaction?
  • A. ΔG = -RT ln(K)
  • B. ΔG = RT ln(K)
  • C. ΔG = KRT
  • D. ΔG = K/R
Q. What is the relationship between the equilibrium constants Kp and Kc for a gaseous reaction?
  • A. Kp = Kc
  • B. Kp = Kc(RT)^(Δn)
  • C. Kp = Kc/RT
  • D. Kp = Kc(RT)^(Δn) where Δn is the change in moles of gas
Q. What is the relationship between the Gibbs free energy change (ΔG) and the equilibrium constant (K)?
  • A. ΔG = -RT ln(K)
  • B. ΔG = RT ln(K)
  • C. ΔG = K - RT
  • D. ΔG = 0 at equilibrium
Q. What is the relationship between the molality of a solution and its boiling point elevation?
  • A. Directly proportional
  • B. Inversely proportional
  • C. No relationship
  • D. Exponential relationship
Q. What is the relationship between ΔG and equilibrium constant K?
  • A. ΔG = -RT ln K
  • B. ΔG = RT ln K
  • C. ΔG = KRT
  • D. ΔG = K/R
Q. What is the relationship between ΔG and the equilibrium constant (K)?
  • A. ΔG = -RT ln(K)
  • B. ΔG = RT ln(K)
  • C. ΔG = KRT
  • D. ΔG = K - RT
Q. What is the relationship between ΔG, ΔH, and ΔS at constant temperature?
  • A. ΔG = ΔH + TΔS
  • B. ΔG = ΔH - TΔS
  • C. ΔG = TΔS - ΔH
  • D. ΔG = ΔH/ΔS
Q. What is the relationship between ΔH and ΔG at equilibrium?
  • A. ΔG = 0
  • B. ΔH = 0
  • C. ΔG = ΔH
  • D. ΔG = ΔH + TΔS
Q. What is the relationship between ΔH and ΔU for a reaction at constant pressure?
  • A. ΔH = ΔU + PΔV
  • B. ΔH = ΔU - PΔV
  • C. ΔH = ΔU
  • D. ΔH = PΔV
Q. What is the role of a catalyst in a redox reaction?
  • A. Increase oxidation
  • B. Increase reduction
  • C. Speed up the reaction
  • D. Change the products
Q. What is the role of a salt bridge in a galvanic cell?
  • A. To provide a pathway for electrons
  • B. To maintain charge balance
  • C. To increase voltage
  • D. To decrease resistance
Q. What is the role of activated charcoal in adsorption processes?
  • A. Catalyst
  • B. Adsorbent
  • C. Solvent
  • D. Reagent
Q. What is the role of the cathode in an electrochemical cell?
  • A. Oxidation occurs
  • B. Reduction occurs
  • C. Electrons are lost
  • D. Ions are produced
Q. What is the shape of a molecule with the formula AX3E?
  • A. Trigonal planar
  • B. Tetrahedral
  • C. Trigonal pyramidal
  • D. Bent
Q. What is the shape of the ammonia (NH3) molecule?
  • A. Linear
  • B. Trigonal planar
  • C. Tetrahedral
  • D. Trigonal pyramidal
Q. What is the shape of the d orbitals?
  • A. Spherical
  • B. Dumbbell
  • C. Double dumbbell
  • D. Linear
Q. What is the shape of the molecular orbital in the case of a π bond?
  • A. Spherical
  • B. Dumbbell
  • C. Linear
  • D. Planar
Q. What is the shape of the molecular orbital in the highest occupied molecular orbital (HOMO) of benzene?
  • A. Linear
  • B. Trigonal planar
  • C. Tetrahedral
  • D. Cyclic
Q. What is the shape of the molecular orbital of the highest energy in O2?
  • A. spherical
  • B. dumbbell
  • C. double dumbbell
  • D. linear
Q. What is the shape of the molecular orbital of the highest energy in the O2 molecule?
  • A. Linear
  • B. Bent
  • C. Planar
  • D. Diatomic
Q. What is the shape of the molecule PCl5?
  • A. Trigonal bipyramidal
  • B. Octahedral
  • C. Tetrahedral
  • D. Square planar
Q. What is the shape of the molecule SF6 according to VSEPR theory?
  • A. Square planar
  • B. Octahedral
  • C. Trigonal bipyramidal
  • D. Tetrahedral
Q. What is the shape of the molecule with the formula AX2E2 according to VSEPR theory?
  • A. Linear
  • B. Bent
  • C. Trigonal planar
  • D. Tetrahedral
Q. What is the shape of the molecule with the formula AX3E?
  • A. Tetrahedral
  • B. Trigonal pyramidal
  • C. Trigonal planar
  • D. Bent
Q. What is the shape of the molecule with the formula AX4?
  • A. Tetrahedral
  • B. Square planar
  • C. Trigonal bipyramidal
  • D. Octahedral
Q. What is the shape of the p-orbital?
  • A. Spherical
  • B. Dumbbell
  • C. Double dumbbell
  • D. Linear
Q. What is the shape of the water molecule (H2O)?
  • A. Linear
  • B. Bent
  • C. Trigonal planar
  • D. Tetrahedral
Q. What is the significance of the BET theory in surface chemistry?
  • A. Describes physisorption
  • B. Describes chemisorption
  • C. Determines surface area of solids
  • D. Calculates adsorption energy
Q. What is the significance of the Gibbs Free Energy in chemical thermodynamics?
  • A. It predicts the direction of a reaction.
  • B. It measures the heat of reaction.
  • C. It indicates the concentration of reactants.
  • D. It determines the rate of reaction.
Q. What is the significance of the Gibbs Free Energy of formation (ΔGf°)?
  • A. It indicates the stability of a compound.
  • B. It is the energy required to form a compound from its elements.
  • C. It is always negative.
  • D. It is temperature dependent.
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