Chemistry assignment

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Across
  1. 1. which one of the following is acidic?(a) lemon juice (b) tomatoes (c)milk (d)all
  2. 6. In a chemical reaction between sulphuric acid and barium chloride solution the white precipitates formed are of:
  3. 8. Which gase is used in the storage of fat and oil containing foods for a long time?
  4. 9. which one of the following will turn red litmus blue?(a)vinegar (b)baking soda (c)lemon juice (d)soft drinks
  5. 10. this is used for dissolution of gold..
  6. 12. Nature of calium phosphate present in tooth ennamel...
  7. 13. aqueous solution of sodium chloride is..
  8. 14. on heating blue coloured powder of copper(II) nitrate in a boiling tube, copper oxide(black), oxygen gas and a brown gas X is formed. Identify the brown gas X.
  9. 15. In addition to sodium hydrogen carbonate, baking powder contains a substance X. Name X.
Down
  1. 1. used to build airplane bodies?
  2. 2. which one of the following will turn blue litmus red?(a)vinegar (b)lime water (c)baking soda (d)washing soda
  3. 3. A metal that do not react with water at all?
  4. 4. when a magnesium ribbon is burnt in air, the ash formed is
  5. 5. the respiration process during which glucose undergoes slow combustion by combining with oxygen in the cells of our body to produce energy, is a kind of:
  6. 6. alloy of copper and zinc?
  7. 7. A white salt on heating decomposes to give brown fumes and yellow residue is left behind. Name the salt.
  8. 11. which acid is found in apples?