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The rusting of iron is formulated as Fe(...

The rusting of iron is formulated as `Fe_(2)O_(3)*xH_(2)O` which involves the formation of:

A

`Fe_2O_3`

B

`Fe(OH)_3`

C

`Fe(OH)_2`

D

`Fe_2O_3 + Fe(OH)_3`

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The correct Answer is:
D
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The rusting of iron occurs as 4Fe(s)+3O_(2)(g)to 2Fe_(2)O_(3)(s) . Enthalpy of formation of Fe_(2)O_(3)(s) is -824.2 kJ mol^(-1) and entropy change for the reaction, i.e., Delta S_("system") , is -549 J K^(-1) mol^(-1) . Calculate Delta S_("surrounding") and predict whether rusting of iron is spontaneous or not at 298 K.

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MOTION-D-BLOCK ELEMENTS -Exercise II (LEVEL–I)
  1. x,y and z are respectively-

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  2. underset(("bot"))(Cu+conc.HNO(3))toCu(NO(3))(2)+X (oxide of nitrogen...

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  3. When KMnO(4) solution is added to hot oxalic acid solution, the decolo...

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  4. CuSO(4) solution reacts with excess of KCN solution to form:-

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  5. The higher oxidation states of transition elements are found to be in ...

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  6. 1 mole of Fe^(2+) ions are oxidised to Fe^(3+) ions with the help of (...

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  7. The metals present in insulin and haemoglobin are respectively:

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  8. The rusting of iron is formulated as Fe(2)O(3)*xH(2)O which involves t...

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  9. Metre scales are madeup of alloy:

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  10. A metal M which is not affected by strong acids like conc. HNO(3),conc...

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  11. Solid CuSO(4)*5H(2)O having covalent, ionic as well as co-ordinate bon...

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  12. underset"(acidified)"(KMnO4)+ HCl to H2O + X(g) , X is a

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  13. Purple of Cassius is

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  14. Amongst the following species, maximum covalent character is exhibited...

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  15. Number of moles of SnCl2 required for the reduction of 1 mole of K2Cr2...

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  16. Pick out the incorrect statement :

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  17. Manganese steel is used for making railway tracks because:

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  18. In nitroprusside ion, the iron and NO exist as Fe(II) and NO^(+) rathe...

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  19. Transition elements in lower oxidation states act as Lewis acid becaus...

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