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General Knowledge :: Chemistry

  1. The hydronium ion is

  2. A.
    H+
    B.
    HO -
    C.
    H2+
    D.
    H3O+

  3. The most electropositive elements among the following is

  4. A.
    Na
    B.
    Ca
    C.
    K
    D.
    Cs

  5. The method that cannot be used for removing permanent hardness of water is

  6. A.
    adding sodium carbonate
    B.
    distillation
    C.
    adding caustic soda
    D.
    boiling

  7. The following are the half lives of four active isotopes. Which one of the following is the most dangerous to handle?

  8. A.
    3 billion years
    B.
    100 years
    C.
    0.01 minute
    D.
    13 days

  9. The gas used for artificial ripening of green fruit is

  10. A.
    ethylene
    B.
    ethane
    C.
    carbon dioxide
    D.
    acetylene

  11. Zone refining is used for the purification of

  12. A.
    Au
    B.
    Ge
    C.
    Ag
    D.
    Cu

  13. The main chemical constituent of the oil of cardamom which is responsible for flavour of this oil is

  14. A.
    cineole
    B.
    engenol
    C.
    geraniol
    D.
    limonene

  15. The molecule which has the highest percentage of ionic character among the following is

  16. A.
    HI
    B.
    HF
    C.
    HCI
    D.
    HBr

  17. The high reactivity of fluorine is due to

  18. A.
    its high electro negativity
    B.
    small size of fluorine atom
    C.
    availability of d-orbitals
    D.
    strong F - F bond

  19. The iron ore magnetite consists of

  20. A.
    Fe2O3
    B.
    Fe3OH4
    C.
    FeCO3
    D.
    3Fe2O3 .. 3H2O