Selected MCQ

Current Question
The rate law for a reaction must be determined by:
  • A. Stoichiometry
  • B. Experiment
  • C. Thermodynamics
  • D. Equilibrium constant
Correct Answer: B
Explanation:
Reaction order is experimentally determined.
Related Question 1
In SN1 reactions, the rate-determining step is:
  • A. Nucleophilic attack
  • B. Carbocation formation
  • C. Proton transfer
  • D. Solvent evaporation
Correct Answer: B
Explanation:
SN1 rate depends on unimolecular leaving-group departure to form a carbocation.
Related Question 2
Which factor increases reaction rate?
  • A. Lower temperature
  • B. Higher activation energy
  • C. Catalyst
  • D. Decreasing concentration
Correct Answer: C
Explanation:
Catalyst lowers activation energy.
Related Question 3
Which hormone controls metabolism rate?
  • A. Insulin
  • B. Thyroxine
  • C. Adrenaline
  • D. Estrogen
Correct Answer: B
Explanation:
Thyroxine regulates metabolic rate.
Related Question 4
Which reaction forms ester?
  • A. Hydrolysis
  • B. Esterification
  • C. Oxidation
  • D. Reduction
Correct Answer: B
Explanation:
Acid + alcohol forms ester.
Related Question 5
Which reaction releases electrons?
  • A. Reduction
  • B. Oxidation
  • C. Neutralization
  • D. Precipitation
Correct Answer: B
Explanation:
Oxidation is loss of electrons.