Chemistry (School & UG)

Q. What is the mechanism of the nitration of benzene?
  • A. Electrophilic addition
  • B. Nucleophilic substitution
  • C. Electrophilic substitution
  • D. Radical substitution
Q. What is the mechanism of the reaction between 1-bromobutane and sodium hydroxide in ethanol?
  • A. SN1
  • B. SN2
  • C. E1
  • D. E2
Q. What is the mechanism of the reaction between an alkyl halide and a nucleophile in a bimolecular nucleophilic substitution (SN2)?
  • A. Nucleophile attacks from the back side, leading to inversion of configuration
  • B. Nucleophile attacks from the front side, leading to retention of configuration
  • C. Formation of a carbocation intermediate
  • D. Nucleophile attacks the halogen first
Q. What is the mechanism of the reaction between an alkyl halide and a nucleophile in a bimolecular nucleophilic substitution (SN2) reaction?
  • A. The nucleophile attacks the carbon from the opposite side of the leaving group.
  • B. The nucleophile attacks the carbon from the same side as the leaving group.
  • C. The reaction proceeds through a carbocation intermediate.
  • D. The reaction involves the formation of a cyclic intermediate.
Q. What is the mechanism of the reaction of 2-bromobutane with potassium cyanide?
  • A. SN1
  • B. SN2
  • C. E1
  • D. E2
Q. What is the molarity of a sodium hydroxide solution if 0.4 moles are dissolved in 2 liters of water?
  • A. 0.2 M
  • B. 0.4 M
  • C. 0.5 M
  • D. 0.8 M
Q. What is the molecular formula for 2,3-dimethylpentane?
  • A. C7H16
  • B. C8H18
  • C. C6H14
  • D. C5H12
Q. What is the molecular formula for 2-butyne?
  • A. C4H8
  • B. C4H6
  • C. C4H10
  • D. C4H12
Q. What is the molecular formula for 3-methyl-1-butyne?
  • A. C5H10
  • B. C5H8
  • C. C6H10
  • D. C6H12
Q. What is the molecular formula of 2,3-dimethylbutane?
  • A. C7H16
  • B. C6H14
  • C. C8H18
  • D. C5H12
Q. What is the molecular formula of 2-butyne?
  • A. C4H6
  • B. C4H8
  • C. C4H10
  • D. C4H4
Q. What is the molecular formula of the compound formed when hydrogen reacts with chlorine?
  • A. HCl
  • B. H2Cl2
  • C. Cl2H2
  • D. H3Cl
Q. What is the molecular geometry of a molecule with 2 bonding pairs and 2 lone pairs on the central atom?
  • A. Linear
  • B. Trigonal Planar
  • C. Tetrahedral
  • D. Bent
Q. What is the molecular geometry of a molecule with a trigonal bipyramidal electron geometry and one lone pair?
  • A. T-shaped
  • B. Linear
  • C. Trigonal planar
  • D. Octahedral
Q. What is the molecular geometry of CO2?
  • A. Linear
  • B. Bent
  • C. Trigonal Planar
  • D. Tetrahedral
Q. What is the molecular geometry of NH3?
  • A. Linear
  • B. Trigonal planar
  • C. Tetrahedral
  • D. Trigonal pyramidal
Q. What is the molecular geometry of PCl5?
  • A. Trigonal planar
  • B. Tetrahedral
  • C. Octahedral
  • D. Trigonal bipyramidal
Q. What is the molecular geometry of SF6?
  • A. Octahedral
  • B. Tetrahedral
  • C. Trigonal bipyramidal
  • D. Square planar
Q. What is the molecular geometry of sulfur hexafluoride (SF6)?
  • A. Octahedral
  • B. Tetrahedral
  • C. Trigonal bipyramidal
  • D. Square planar
Q. What is the molecular geometry of the sulfate ion (SO4^2-)?
  • A. Linear
  • B. Trigonal planar
  • C. Tetrahedral
  • D. Octahedral
Q. What is the Nernst equation for a half-reaction involving 2 electrons at 25°C?
  • A. E = E° - 0.059/n log(Q)
  • B. E = E° + 0.059/n log(Q)
  • C. E = E° - 0.0257/n log(Q)
  • D. E = E° + 0.0257/n log(Q)
Q. What is the Nernst equation used for calculating the cell potential under non-standard conditions?
  • A. E = E° - (RT/nF)ln(Q)
  • B. E = E° + (RT/nF)ln(Q)
  • C. E = E° - (nF/RT)ln(Q)
  • D. E = E° + (nF/RT)ln(Q)
Q. What is the Nernst equation used for in electrochemistry?
  • A. Calculating cell potential
  • B. Determining reaction rate
  • C. Measuring pH
  • D. Assessing temperature changes
Q. What is the net ionic equation for the reaction between H2SO4 and NaOH?
  • A. H+ + OH- -> H2O
  • B. Na+ + SO4^2- -> Na2SO4
  • C. H2SO4 + NaOH -> Na2SO4 + H2O
  • D. H2O -> H+ + OH-
Q. What is the order of a reaction if the rate law is given by rate = k[A]^2[B]?
  • A. 0
  • B. 1
  • C. 2
  • D. 3
Q. What is the oxidation state of chromium in potassium dichromate (K2Cr2O7)?
  • A. 0
  • B. +3
  • C. +6
  • D. +7
Q. What is the oxidation state of chromium in the complex ion [Cr(NH3)6]Cl3?
  • A. +2
  • B. +3
  • C. +4
  • D. +6
Q. What is the oxidation state of chromium in the complex [Cr(NH3)4Cl2]+?
  • A. +2
  • B. +3
  • C. +4
  • D. +6
Q. What is the oxidation state of chromium in the complex [Cr(NH3)6]Cl3?
  • A. +2
  • B. +3
  • C. +4
  • D. +6
Q. What is the oxidation state of hydrogen in HCl?
  • A. -1
  • B. 0
  • C. +1
  • D. +2
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