1. A base is known as a 'proton _______'.   acceptor   donor   2. Acids are bitter in taste.   True   False   3. Which of the following is known as a 'proton donor'?   water   salt   acid   base   Hint Half-n-half Clue   4. _______ acid is used in the manufacture of many car batteries.   Phosphoric   Nitric   Sulfuric   Hydrochloric   Half-n-half Clue   5. _______ is a basic gas which is used in the manufacture of fertilizers such as Urea.   Nitrogen   Oxygen   Ammonia   Chlorine   Half-n-half Clue   6. Which of the following salts is insoluble in water?   Zinc sulfide   Potassium phosphate   Barium chloride   Ammonium carbonate   Half-n-half Clue   7. _______ acid is responsible for the 'fizz' in soft drinks.   Carbonic   Oxalic   Acetic   Citric   Half-n-half Clue