1. Which of the following is not a physical change?   Oxidation   Precipitation   Decantation   Distillation   Hint Half-n-half Clue   2. Fill in the missing word Acid + _______ = Salt + Water   Metal   Non Metal   Oxygen   Base   Half-n-half Clue   3. The lead of a pencil mainly contains   Carbon Black   Plastics   Lead   Graphite   Half-n-half Clue   4. What gas is evolved when dilute sulphuric acid is added to Zinc?   Sulphur Dioxide   Hydrogen Peroxide   Hydrogen   Argon   Half-n-half Clue   5. Which of the following is not an acid?   H2SO4   HCl   HNO3   NaOH   Half-n-half Clue   6. Fizziness in Coco-Cola/Pepsi is caused by   Helium   Nitrogen   Hydrogen   Carbon Dioxide   Half-n-half Clue   7. What is the combination of any substance with oxygen known as?   Reduction   Combustion   Oxidation   Hydrogenation   Half-n-half Clue