1. If no more solute can be dissolved in a solvent at a given temperature then that solution is called _______.   a dispersed solution   a real solution   an unstable solution   a saturated solution   Hint Half-n-half Clue   2. Solubility of a substance in a solvent usually increases with an increase in temperature.   True   False   3. Which of the following gases is green in color?   Neon   Chlorine   Hydrogen   Krypton   Half-n-half Clue   4. The lead of a pencil mainly contains _______.   graphite   plastics   lead   carbon black   Half-n-half Clue   5. What is the combination of any substance with oxygen known as?   Oxidation   Reduction   Combustion   Hydrogenation   Half-n-half Clue   6. A substance that speeds up the rate of a chemical reaction without undergoing any change itself is known as a _______.   catalyst   counter ion   cation   nucleus   Half-n-half Clue   7. Which of the following is a chemical change?   Dissolving of salt in water   Freezing of water   Boiling of water   Rusting of iron   Half-n-half Clue