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Passivity of iron is due to the formatio...

Passivity of iron is due to the formation of a thin layer of :

A

`Fe_(3)O_(4)`

B

`Fe_(2)O_(3)`

C

`FeS_(2)`

D

`FeCO_(3)`.

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The correct Answer is:
A
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MODERN PUBLICATION-CHEMISTRY OF D-AND F-BLOCK ELEMENTS-Multiple Choice Questions (Level -I) Transition metal compounds and their Characteristics
  1. In a redox reaction, how many moles of electrons are accepted by 1 mol...

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  2. Cr(2)O(3) dissolves in aqueous NaOH in the presence of an oxidant to f...

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  3. Passivity of iron is due to the formation of a thin layer of :

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  4. Two fo the constituents of German silver are :

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  5. The compound which gives off oxygen on moderate heating is :

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  6. Nessler's reagent is :

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  7. The black oxide of copper (CuO) in attacked by moisture and carbon dio...

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  8. FeCl(3) has each of the following characteristics except :

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  9. Thomas slag is :

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  10. Blister copper is :

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  11. Iron is obtained on a large scale by reduction of Fe(2)O3 with :

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  12. Which of the following ions exist as dimer ?

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  13. Kl and CuSO(4) solutions when mixed give :

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  14. Ammonium dichromate is used in fireworks. The green coloured blown in ...

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  15. The number of moles of KMnO4 that will be needed to react with one mol...

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  16. Silica is added to roasted copper ore during smelting in order to remo...

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  17. Iron is rendered passive when treated with conc. :

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  18. The principal oxidation state of lanthanides is :

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  19. The lanthanoid contraction refers to :

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  20. Which of the following is not correct ?

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