1. The 'fizz' in soft drinks is caused by _______.   Carbon dioxide   helium   nitrogen   hydrogen   Hint Half-n-half Clue   2. Which of the following is not an acid?   HNO3   HCl   NaOH   H2SO4   Half-n-half Clue   3. Lemon juice is _______ in nature.   metallic   acidic   basic   neutral   Half-n-half Clue   4. 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   an unstable solution   a dispersed solution   Half-n-half Clue   5. Catalysts speed up the rate of chemical reactions.   True   False   6. A substance that speeds up the rate of a chemical reaction without undergoing any change itself is known as a _______.   catalyst   cation   counter ion   nucleus   Half-n-half Clue   7. What gas is evolved when dilute sulfuric acid is added to zinc?   Hydrogen   Sulfur Dioxide   Hydrogen Peroxide   Argon   Half-n-half Clue