Electrochemistry and Thermodynamics Quiz
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Questions and Answers

What are the oxidation states of Mn in the species P and Q, respectively?

  • −1 and +1 (correct)
  • +1 and +1
  • −1 and −1
  • +1 and −1 (correct)

    • What is the number and nature of d-d transition(s) for Sc2+ in an octahedral crystal field?

  • 3 and Laporte allowed
  • 1 and spin allowed (correct)
  • 3 and spin allowed (correct)
  • 1 and Laporte allowed

    • In the case of [Mn(H2O)6]2+ and [Ti(H2O)4]3+, how do their d-d transitions compare in terms of symmetry?

  • symmetry forbidden and symmetry forbidden
  • symmetry allowed and symmetry forbidden (correct)
  • symmetry forbidden and symmetry allowed
  • symmetry allowed and symmetry allowed (correct)

    • How many d-d transitions occur in the case of [Ti(H2O)4]3+ within an octahedral field configuration?

    <p>3 and symmetry allowed</p> Signup and view all the answers

    Which statement is true regarding the d-d transitions of Mn2+ in a crystal field?

    <p>They can be both allowed and forbidden depending on the field strength.</p> Signup and view all the answers

    What is the standard EMF of the cell given the activities of P and Q+?

    <p>$-\frac{RT \ln(2)}{F}$</p> Signup and view all the answers

    Which statement correctly describes the kinetic theory of gases regarding nitrogen and oxygen at the same temperature?

    <p>Average kinetic energies of nitrogen and oxygen molecules are equal.</p> Signup and view all the answers

    During a clockwise cycle, which of the following statements about the system is true?

    <p>System performs work on the surroundings during the cycle.</p> Signup and view all the answers

    What happens to the average kinetic energy of gases if their temperature is increased?

    <p>It increases for both gases.</p> Signup and view all the answers

    Which option correctly predicts the behavior of photoelectrons emitted as a function of light frequency in the photoelectric effect?

    <p>No photoelectrons are emitted below the threshold frequency.</p> Signup and view all the answers

    When comparing the root mean square speed of nitrogen and oxygen, which statement is correct?

    <p>Root mean square speed of oxygen is higher.</p> Signup and view all the answers

    What can be said about the heat exchanged in a cycle that returns to the same state?

    <p>Heat exchanged is zero during the cycle.</p> Signup and view all the answers

    Regarding the behavior of entropy in a cycle, which statement is accurate?

    <p>Entropy can increase, decrease, or remain constant during a cycle.</p> Signup and view all the answers

    What are the constituent α-amino acids of the given dipeptide used as an artificial sweetener?

    <p>phenylalanine and aspartic acid</p> Signup and view all the answers

    Which reagent combination is suitable for the specified transformation involving ketone and alcohol?

    <p>(i) OsO4; (ii) aq.HCl</p> Signup and view all the answers

    How does increasing the concentration of KCN four times affect the rate of the reaction with bromobenzene?

    <p>increased by four times</p> Signup and view all the answers

    Upon analyzing the wavefunction 𝜓(𝑥) = 𝑁[exp(𝑖𝑘𝑥) + exp(−𝑖𝑘𝑥)], which of the following statements about its normalization condition is true?

    <p>It must satisfy the condition ∫|𝜓(𝑥)|^2 dx = 1.</p> Signup and view all the answers

    Which property of the given wavefunction indicates it represents a standing wave?

    <p>It is a superposition of two traveling waves.</p> Signup and view all the answers

    What would be the effect on the reaction rate if KCN concentration is decreased instead of increased?

    <p>Reaction rate decreases substantially.</p> Signup and view all the answers

    In the given transformation, which reagent is most likely to facilitate dihydroxylation of a double bond?

    <p>OsO4</p> Signup and view all the answers

    Which of the following structures represents the product of the reaction with MeOH and BF3 OEt2?

    <p>OMe Ph OMe</p> Signup and view all the answers

    Which characteristic of the reaction mechanism is most directly affected by substrate structure when reacting with KCN?

    <p>Type of intermediates formed</p> Signup and view all the answers

    Which order of acidity is correct for the compounds I, II, III, and IV?

    <p>II &gt; IV &gt; III &gt; I</p> Signup and view all the answers

    What is the major product formed when PhNH2 reacts with Br2 and aq. KOH followed by treatment with aq. HCl?

    <p>Br O Ph OH</p> Signup and view all the answers

    What is the ratio of osmotic pressures of 0.01 M BaCl2 to 0.005 M NaCl, considering complete dissociation in water?

    <p>3:1</p> Signup and view all the answers

    In the cell reaction P + (aq) + Q(s) → P(s) + Q+ (aq), what can be concluded about the EMF of the cell?

    <p>The EMF is zero.</p> Signup and view all the answers

    Which compound in the reaction of PhNH2 with Br2, aq. KOH is most likely to be an intermediate?

    <p>Ph O Br</p> Signup and view all the answers

    Which of the following would exhibit the highest osmotic pressure when fully dissolved in water?

    <p>0.01 M CaCl2</p> Signup and view all the answers

    Based on the order of acidity provided, which compound is the least acidic?

    <p>Compound IV</p> Signup and view all the answers

    Which compound reacts with CH3MgBr followed by aqueous NH4Cl to yield 1-methyl-1-phenylethanol as the primary product?

    <p>Methyl benzoate</p> Signup and view all the answers

    Which of the following compounds will yield the same osazone as that from D-glucose when reacted with phenylhydrazine?

    <p>Mannose</p> Signup and view all the answers

    Which molecule is chiral among the following options?

    <p>Molecule with unique substituents around a central carbon</p> Signup and view all the answers

    Which assumption is NOT necessary to derive the Langmuir adsorption isotherm?

    <p>Adsorption enhances the rate of all neighboring sites</p> Signup and view all the answers

    What is the product of the condensation of a ketone with an acid hydrazine agent?

    <p>Hydrazone</p> Signup and view all the answers

    In the context of adsorption isotherms, what does 'monolayer coverage' imply?

    <p>Only one layer of molecules occupies available sites</p> Signup and view all the answers

    Which of the following represents a characteristic of chiral molecules?

    <p>They rotate plane-polarized light</p> Signup and view all the answers

    Which statement about osazone formation is true?

    <p>Only aldoses can form osazones</p> Signup and view all the answers

    Study Notes

    Electrochemistry

    • The standard EMF of the cell, 𝐸𝑐𝑒𝑙𝑙 is 𝑅𝑇 ln(2) / 𝐹
    • The activities of all solids are unity.
    • The activity of P+ (𝑎𝑞) is 2 M.
    • The activity of Q+ (𝑎𝑞) is 1 M.
    • 𝑅 = universal gas constant
    • 𝑇 = temperature
    • 𝐹 = Faraday constant

    Photoelectric Effect

    • The number of incident photons is the same for all frequencies.
    • The plot of the number of photoelectrons (n) emitted as a function of the incident light frequency (ν) has a linear relationship.

    Kinetic Theory of Gases

    • The average kinetic energies of nitrogen and oxygen molecules are equal, assuming both gases are at the same temperature.

    Thermodynamics

    • A system undergoes one clockwise cycle from point X back to point X.
    • The internal energy of the system decreases at the end of the cycle.
    • The entropy of the system increases at the end of the cycle.
    • The system performs work on the surroundings during the cycle.
    • The heat exchanged between the system and surroundings is zero during the cycle.

    Organic Chemistry

    • The following dipeptide derivative is used as an artificial sweetener:

                      NH2         O
                       H
     HO2C              N
                                  OCH3
                   O

    • The constituent -amino acids of this dipeptide are phenylalanine and aspartic acid.

    Spectroscopy

    • The d-d transitions in [Mn(H2O)6]2+ and [Ti(H2O)4]3+ are symmetry forbidden and symmetry allowed, respectively.

    Chemical Reactions

    • The oxidation states of Mn in Na[Mn(CO)5] (P) and [CH3Mn(CO)5] (Q) are -1 and +1, respectively.

    Physical Chemistry

    • The ratio of osmotic pressures of aqueous solutions of 0.01 M BaCl2 to 0.005 M NaCl is 3:1.

    Organic Chemistry

    • The compound methyl benzoate, when reacted with CH3MgBr followed by treatment with aqueous NH4Cl, would produce 1-methyl-1-phenylethanol as the major product.

    Stereoisomers

    • The chiral molecules in the set are:
      • Cl Me Me Cl
      •               CO2H
 Me

      •              Me
 Me              Cl
       Cl

    Adsorption

    • The correct assumptions required to derive Langmuir adsorption isotherm are:
      • Adsorption is limited to a monolayer on the adsorbing surface.
      • All binding sites on the adsorbing surface are identical.
      • The rate of adsorption and rate of desorption are equal at equilibrium.

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