1. A pH below 7 indicates _______.   alkalinity   presence of ions   acidity   purity of the sample   Hint Half-n-half Clue   2. The 'fizz' in soft drinks is caused by _______.   Carbon dioxide   helium   hydrogen   nitrogen   Half-n-half Clue   3. Which of the following is not an allotrope of carbon?   Silk   Charcoal   Diamond   Graphite   Half-n-half Clue   4. Which of the following is a chemical change?   Boiling of water   Freezing of water   Rusting of iron   Dissolving of salt in water   Half-n-half Clue   5. A substance that absorbs moisture is called _______.   hydrophobic   amorphous   hygroscopic   hydrophilic   Half-n-half Clue   6. If no more solute can be dissolved in a solvent at a given temperature then that solution is called _______.   a real solution   a saturated solution   a dispersed solution   an unstable solution   Half-n-half Clue   7. Acids turn blue litmus paper _______.   yellow   pink   red   colorless   Half-n-half Clue