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Question

The standard formation reaction for aluminium oxide is 4Al(s)+6O(g)2Al2O3(s). This statement is false because:

A
aluminium is not in its standard state
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B
the reaction should be written for one mole of Al
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C
The reaction is prevented by a thin film of Al2O3 formed on the surface of Al
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D
none of these
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Solution

The correct option is B the reaction should be written for one mole of Al
2Al+3O2Al2O3

The enthalpy of the above reaction is enthalpy of formation as one mole of Al2O3 is forming from elemental aluminum and oxygen gas.

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