1. If no more solute can be dissolved in a solvent at a given temperature then that solution is called _______.   a saturated solution   a real solution   an unstable solution   a dispersed solution   Hint Half-n-half Clue   2. Which of the following is not a physical change?   Distillation   Precipitation   Oxidation   Decantation   Half-n-half Clue   3. Which of the following is a chemical change?   Boiling of water   Rusting of iron   Dissolving of salt in water   Freezing of water   Half-n-half Clue   4. The lead of a pencil mainly contains _______.   graphite   lead   plastics   carbon black   Half-n-half Clue   5. What is the combination of any substance with oxygen known as?   Hydrogenation   Oxidation   Combustion   Reduction   Half-n-half Clue   6. Fill in the missing word: Acid + _______ = Salt + Water   Non Metal   Base   Oxygen   Metal   Half-n-half Clue   7. Which of the following gases is green in color?   Krypton   Chlorine   Neon   Hydrogen   Half-n-half Clue