1. Which of the following is not an allotrope of carbon?   Diamond   Charcoal   Graphite   Silk   Hint Half-n-half Clue   2. Which of the following is not an acid?   NaOH   HNO3   HCl   H2SO4   Half-n-half Clue   3. A pH below 7 indicates _______.   acidity   presence of ions   alkalinity   purity of the sample   Half-n-half Clue   4. Catalysts speed up the rate of chemical reactions.   True   False   5. A substance that speeds up the rate of a chemical reaction without undergoing any change itself is known as a _______.   nucleus   counter ion   catalyst   cation   Half-n-half Clue   6. A substance that absorbs moisture is called _______.   hydrophilic   hydrophobic   hygroscopic   amorphous   Half-n-half Clue   7. Which of the following gases is green in color?   Chlorine   Hydrogen   Neon   Krypton   Half-n-half Clue