Across
- 1. which one of the following will turn red litmus blue?(a)vinegar (b)baking soda (c)lemon juice (d)soft drinks
- 3. which one of the following is acidic?(a) lemon juice (b) tomatoes (c)milk (d)all
- 6. which acid is found in apples?
- 7. A metal that do not react with water at all?
- 8. used to build airplane bodies?
- 9. In a chemical reaction between sulphuric acid and barium chloride solution the white precipitates formed are of:
- 11. 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.
- 12. 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:
- 14. In addition to sodium hydrogen carbonate, baking powder contains a substance X. Name X.
Down
- 2. Which gase is used in the storage of fat and oil containing foods for a long time?
- 4. A white salt on heating decomposes to give brown fumes and yellow residue is left behind. Name the salt.
- 5. alloy of copper and zinc?
- 10. which one of the following will turn blue litmus red?(a)vinegar (b)lime water (c)baking soda (d)washing soda
- 13. when a magnesium ribbon is burnt in air, the ash formed is