23. Which of the following compounds is the strongest base in water? (A)B2O3(B) CO2(C)CI2O(D) K2O(E)

3.What is the scientific contribution for the 2011 Nobel Laureate Dr. Dan Shechtman? (A) Discovered the icosahedral phase of quasiperiodic crystals (B) Pioneering work on graphenc. (C) Developed the cathode material of Li-ion battery (D) Discover the buckminsterfullerene (E) For the discovery of new superconducting materials