1. Which of the following salts is insoluble in water?   Ammonium carbonate   Zinc sulfide   Potassium phosphate   Barium chloride   Hint Half-n-half Clue   2. Sodium sulfate is a normal salt whereas Sodium bisulfate is an acid salt.   True   False   3. Vinegar is very dilute _______ acid.   carbonic   acetic   citric   phosphoric   Half-n-half Clue   4. Which of the following is known as a 'proton donor'?   base   salt   water   acid   Half-n-half Clue   5. Aqua Regia contains concentrated Nitric acid and concentrated Hydrochloric acid in the ratio 1:3.   True   False   6. _______ is a basic gas which is used in the manufacture of fertilizers such as Urea.   Ammonia   Oxygen   Nitrogen   Chlorine   Half-n-half Clue   7. Milk contains _______ acid.   oxalic   lactic   citric   boric   Half-n-half Clue