1. Which of the following gases is green in color?   Hydrogen   Krypton   Neon   Chlorine   Hint Half-n-half Clue   2. Acids turn blue litmus paper _______.   colorless   yellow   pink   red   Half-n-half Clue   3. Lemon juice is _______ in nature.   acidic   metallic   basic   neutral   Half-n-half Clue   4. Catalysts speed up the rate of chemical reactions.   True   False   5. Which of the following is not a physical change?   Distillation   Decantation   Oxidation   Precipitation   Half-n-half Clue   6. What gas is evolved when dilute sulfuric acid is added to zinc?   Argon   Hydrogen   Hydrogen Peroxide   Sulfur Dioxide   Half-n-half Clue   7. Which of the following is not an acid?   H2SO4   NaOH   HCl   HNO3   Half-n-half Clue