1. Lemon juice is   Neutral   Basic   Acidic   Metallic   Hint Half-n-half Clue   2. A pH of below 7 indicates   Purity of the sample   Alkalinity   Acidity   Presence of Ions   Half-n-half Clue   3. What is the combination of any substance with oxygen known as?   Hydrogenation   Combustion   Oxidation   Reduction   Half-n-half Clue   4. The lead of a pencil mainly contains   Carbon Black   Lead   Plastics   Graphite   Half-n-half Clue   5. Fill in the missing word Acid + _______ = Salt + Water   Metal   Base   Non Metal   Oxygen   Half-n-half Clue   6. Which of the following is not an acid?   HCl   HNO3   NaOH   H2SO4   Half-n-half Clue   7. Which of the following is not a physical change?   Decantation   Distillation   Precipitation   Oxidation   Half-n-half Clue