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  • Naturally occurring substances or minerals from which metals can be conveniently and economically extracted is ______.

    ;i:3;s:13:
    ;i:1;s:8:
    ;i:2;s:4:
  • The molecular formula of iron is ______.

    Fe2O
    FeS
    FeO
    Fe
  • The valencies of iron are ______.

    3 and 4
    1 and 2
    2 and 3
    1
  • These are the ores of iron ______.

    hematite
    magnetide
    All the answers are correct
    iron pyrite
  • The atomic number of iron is ______.

    26
    22
    24
    25
  • The atomic weight of iron is ______.

    56
    54
    53
    55
  • Iron belongs to ______ of periodic table.

    Group VIII
    Group VI
    Group zero
    Group VII
  • Iron is known as ______.

    none of above
    p block element
    s block element
    d block element
  • The electronic configuration of iron is

    1s2,2s2,2p6,3s2,4s2,4p6
    none of above
    1s2,2s2,2p6,3s2,3p6,4s2,4p6,3d6
    1s2,2s2,2p6,4p6,3d6
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