1. Which of the following is not a physical change?   Distillation   Oxidation   Decantation   Precipitation   Hint Half-n-half Clue   2. A substance which speeds up a chemical reaction without itself getting affected is known as a   Counter Ion   Cation   Catalyst   Nucleus   Half-n-half Clue   3. Which of the following gases is green in color?   Hydrogen   Chlorine   Krypton   Neon   Half-n-half Clue   4. If no more solute can be dissolved in a solvent at a given temperature then that solution is called   A Real Solution   A Dispersed Solution   A Saturated Solution   An Unstable Solution   Half-n-half Clue   5. Fill in the missing word Acid + _______ = Salt + Water   Oxygen   Metal   Non Metal   Base   Half-n-half Clue   6. The lead of a pencil mainly contains   Lead   Graphite   Plastics   Carbon Black   Half-n-half Clue   7. What gas is evolved when dilute sulphuric acid is added to Zinc?   Argon   Sulphur Dioxide   Hydrogen   Hydrogen Peroxide   Half-n-half Clue