1. Lemon juice is   Metallic   Basic   Acidic   Neutral   Hint Half-n-half Clue   2. A substance that absorbs moisture is known as   Hygroscopic   Hydrophilic   Amorphous   Hydrophobic   Half-n-half Clue   3. Catalysts often speed up certain chemical reactions.   False   True   4. Which of the following is not an acid?   H2SO4   HNO3   HCl   NaOH   Half-n-half Clue   5. Which of the following is not an allotrope of carbon   Diamond   Charcoal   Silk   Graphite   Half-n-half Clue   6. Heat is liberated in   Exothermic Reactions   Endothermic Reactions   All chemical reactions   Substitution Reactions   Half-n-half Clue   7. Fizziness in Coco-Cola/Pepsi is caused by   Helium   Nitrogen   Carbon Dioxide   Hydrogen   Half-n-half Clue