All metals do not react with oxygen at the same rate. Different metals show different reactivities towards oxygen. Metals such as potassium and sodium react so vigorously that they catch fire if kept in the open. Hence, to protect them and to prevent accidental fires, they are kept immersed in kerosene oil. At ordinary temperature, the surfaces of metals such as magnesium, aluminium, zinc, lead, etc., are covered with a thin layer of oxide. The protective oxide layer prevents the metal from further oxidation. Iron does not burn on heating but iron filings burn vigorously when sprinkled in the flame of the burner. Copper does not burn, but the hot metal is coated with a black coloured layer of copper(II) oxide. Silver and gold do not react with oxygen even at high temperatures.

Question

(i)Which of the following oxide(s) of iron
would be obtained on prolonged reaction
of iron with steam?
(a).FeO
(b) .Fe2O3
(c) .Fe3O4

(ii).Which one of the given metals does
not react with cold as well as hot water?
(a).Na
(b).Fe

(c).Mg

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Priyanka QNA 2 years 2021-12-19T18:06:23+00:00 1 Answer 220 views Enlightened 0

Answer ( 1 )

    0
    2021-12-19T18:07:17+00:00

    Answer.(c)
    Fe3O4

    Answer.(b)
    Fe

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