1. If no more solute can be dissolved in a solvent at a given temperature then that solution is called _______.   an unstable solution   a real solution   a dispersed solution   a saturated solution   Hint Half-n-half Clue   2. Fill in the missing word: Acid + _______ = Salt + Water   Metal   Base   Non Metal   Oxygen   Half-n-half Clue   3. The lead of a pencil mainly contains _______.   graphite   carbon black   lead   plastics   Half-n-half Clue   4. What is the combination of any substance with oxygen known as?   Oxidation   Reduction   Hydrogenation   Combustion   Half-n-half Clue   5. Lemon juice is _______ in nature.   metallic   basic   neutral   acidic   Half-n-half Clue   6. Which of the following is not an allotrope of carbon?   Silk   Graphite   Charcoal   Diamond   Half-n-half Clue   7. Heat is liberated in _______ reactions.   substitution   endothermic   exothermic   all chemical   Half-n-half Clue