1) Give the ratio in which hydrogen and oxygen are present in water by volume a) 1:2 b) 2:1 c) 3:1 d) 1:3 2) When Ag is exposed to air it gets a black coating of a) Ag2S b) Ag2O c) AgNO3 d) Ag2SO4 3) What type of chemical reactions takes place when electricity is passed through water? a) Displacement b) Decomposition c) Combination d) Double Displacement 4) The process of reduction involves a) Addition of Oxygen b) Removal of Oxygen c) Addition of Hydrogen d) Removal of Hydrogen 5) MnO2 + 4HCl → 2H2O + MnCl2 Identify the substance oxidized in the above equation a) MnCL2 b) MnO2 c) HCl d) H2O

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