1. Aqua Regia contains concentrated Nitric acid and concentrated Hydrochloric acid in the ratio 1:3.   True   False   2. Which of the following salts is insoluble in water?   Zinc sulfide   Ammonium carbonate   Barium chloride   Potassium phosphate   Hint Half-n-half Clue   3. _______ acid is responsible for the 'fizz' in soft drinks.   Citric   Acetic   Oxalic   Carbonic   Half-n-half Clue   4. _______ hydroxide is also known as 'Caustic Potash'.   Calcium   Sodium   Magnesium   Potassium   Half-n-half Clue   5. Which of the following is known as a 'proton donor'?   water   salt   base   acid   Half-n-half Clue   6. A base is known as a 'proton _______'.   acceptor   donor   7. Which of the following salts is soluble in water?   Sodium sulfide   Lead chloride   Barium sulfate   Copper carbonate   Half-n-half Clue