Halogens - 1


1. Sea Water contains more than 5% by weight of dissolved chlorides.


2. Chlorine is 2.5 time denser than air.


3. Hydrochloric acid reacts with metal carbonates to produce hydrogen gas.


4. The formula of calcium oxychloride is CaCl(OCl).


5. Bleaching powder reacts with hydrogen peroxide to give chlorine gas.


6. The word halogens mean salt former.


7. Chlorine is more reactive than iodine.


8. Chemical name for bleaching powder is calcium chloride.


9. Halides are very soluble in water at room temperature.


10. Manganese dioxide acts as an oxidizing agent in the laboratory preparation of chlorine.


11. Chlorine reacts with carbondioxide in the presence of sunlight to produce phosgene gas.


12. Chlorine can displace fluorine from fluorides.


13. Chlorine is used to remove scales and rust from metal surfaces.


14. Hydrochloric acid is used to bleach wood pulp.


15. Slaked lime absorb (35-37%) of chlorine to form bleaching powder.





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