Chemistry (School & UG)

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Q. In a coordination compound, what does the term 'coordination number' refer to?
  • A. The number of ligands attached to the metal ion
  • B. The total number of electrons in the complex
  • C. The oxidation state of the metal ion
  • D. The number of unpaired electrons in the metal
Q. In a Daniell cell, what is the role of the salt bridge?
  • A. To provide a pathway for electrons
  • B. To maintain charge neutrality
  • C. To increase the cell potential
  • D. To facilitate ion exchange
Q. In a Daniell cell, which electrode is the anode?
  • A. Copper electrode
  • B. Zinc electrode
  • C. Silver electrode
  • D. Lead electrode
Q. In a Daniell cell, which species is reduced?
  • A. Zn
  • B. Cu²⁺
  • C. Zn²⁺
  • D. Cu
Q. In a first-order reaction, if the half-life is 10 minutes, what is the rate constant?
  • A. 0.0693 min^-1
  • B. 0.1 min^-1
  • C. 0.693 min^-1
  • D. 0.5 min^-1
Q. In a first-order reaction, if the half-life is 10 minutes, what will be the concentration after 30 minutes if the initial concentration is 1 M?
  • A. 0.125 M
  • B. 0.5 M
  • C. 0.75 M
  • D. 0.25 M
Q. In a first-order reaction, if the half-life is 10 minutes, what will be the half-life if the concentration is doubled?
  • A. 10 minutes
  • B. 20 minutes
  • C. 5 minutes
  • D. It cannot be determined
Q. In a first-order reaction, if the half-life is 10 minutes, what will be the half-life after the concentration is halved?
  • A. 5 minutes
  • B. 10 minutes
  • C. 15 minutes
  • D. 20 minutes
Q. In a first-order reaction, if the half-life is 10 minutes, what will be the half-life if the initial concentration is doubled?
  • A. 10 minutes
  • B. 20 minutes
  • C. 5 minutes
  • D. 15 minutes
Q. In a first-order reaction, if the half-life is 10 minutes, what will be the half-life after doubling the temperature?
  • A. 5 minutes
  • B. 10 minutes
  • C. 20 minutes
  • D. It cannot be determined
Q. In a flame test, which color indicates the presence of sodium ions?
  • A. Green
  • B. Red
  • C. Yellow
  • D. Blue
Q. In a galvanic cell, if the anode reaction is Zn → Zn²⁺ + 2e⁻, what is the half-reaction at the cathode if Cu²⁺ is reduced?
  • A. Cu + 2e⁻ → Cu²⁺
  • B. Cu²⁺ + 2e⁻ → Cu
  • C. Cu²⁺ → Cu + 2e⁻
  • D. Cu → Cu²⁺ + 2e⁻
Q. In a galvanic cell, what is the function of the external circuit?
  • A. To provide a path for ions
  • B. To allow electron flow
  • C. To maintain temperature
  • D. To store energy
Q. In a galvanic cell, what occurs at the anode?
  • A. Reduction of the oxidizing agent.
  • B. Oxidation of the reducing agent.
  • C. Neutralization of acids.
  • D. Formation of a precipitate.
Q. In a galvanic cell, which electrode is the site of reduction?
  • A. Anode
  • B. Cathode
  • C. Salt bridge
  • D. Electrolyte
Q. In a galvanic cell, which reaction occurs at the anode?
  • A. Reduction
  • B. Oxidation
  • C. Neutralization
  • D. Hydrolysis
Q. In a molecule with a triple bond, how many sigma and pi bonds are present?
  • A. 1 sigma, 2 pi
  • B. 2 sigma, 1 pi
  • C. 3 sigma, 0 pi
  • D. 0 sigma, 3 pi
Q. In a nucleophilic substitution reaction, what is the role of the nucleophile?
  • A. To donate a proton
  • B. To accept electrons
  • C. To attack the electrophile
  • D. To stabilize the leaving group
Q. In a nucleophilic substitution reaction, what is the role of the solvent?
  • A. To stabilize the nucleophile
  • B. To stabilize the leaving group
  • C. To provide a medium for the reaction
  • D. To increase the reaction rate
Q. In a phase diagram, what does the line between the solid and liquid phases represent?
  • A. Sublimation point
  • B. Melting point
  • C. Boiling point
  • D. Triple point
Q. In a qualitative analysis using paper chromatography, which factor primarily affects the separation of ions?
  • A. Temperature
  • B. Solvent polarity
  • C. pH of the solution
  • D. Ion concentration
Q. In a qualitative analysis using paper chromatography, which factor primarily affects the Rf value of a substance?
  • A. Solvent polarity
  • B. Temperature
  • C. pH of the solution
  • D. Molecular weight
Q. In a reaction A → B, if the rate of formation of B is 0.5 M/s, what is the rate of disappearance of A?
  • A. 0.5 M/s
  • B. 1.0 M/s
  • C. 0.25 M/s
  • D. 0.75 M/s
Q. In a reaction at equilibrium, what does the equilibrium constant (K) represent?
  • A. The ratio of products to reactants at equilibrium.
  • B. The rate of the forward reaction.
  • C. The change in Gibbs free energy.
  • D. The concentration of reactants only.
Q. In a reaction at equilibrium, what effect does adding an inert gas at constant volume have?
  • A. Shifts the equilibrium to the right
  • B. Shifts the equilibrium to the left
  • C. No effect on the equilibrium
  • D. Increases the reaction rate
Q. In a reaction at equilibrium, what effect does increasing the pressure have if the number of moles of gas on the reactant side is greater than on the product side?
  • A. Shifts to the right
  • B. Shifts to the left
  • C. No effect
  • D. Reaction stops
Q. In a reaction at equilibrium, what effect does increasing the pressure have if the number of moles of gas on the reactant side is greater than that on the product side?
  • A. Shifts to the right
  • B. Shifts to the left
  • C. No effect
  • D. Reaction rate decreases
Q. In a reaction at equilibrium, what effect does increasing the temperature have on an exothermic reaction?
  • A. Shifts equilibrium to the right
  • B. Shifts equilibrium to the left
  • C. No effect on equilibrium
  • D. Increases the rate of reaction
Q. In a reaction at equilibrium, what happens if the concentration of a reactant is increased?
  • A. The equilibrium shifts to the right
  • B. The equilibrium shifts to the left
  • C. The equilibrium remains unchanged
  • D. The reaction stops
Q. In a reaction at equilibrium, what happens if the concentration of reactants is increased?
  • A. The equilibrium shifts to the right
  • B. The equilibrium shifts to the left
  • C. The equilibrium remains unchanged
  • D. The reaction stops
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