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     EduGorilla 
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    An alloy containing 50.2 wt% gold and 49.8 wt% copper is allowed to cool slowly below ______, AuCu3structure forms, in which the gold atoms are located at the corners of the face-centred cubic (fcc) units cells and the copper atoms are located at the centres of the faces.

    Options :-

    1. 400 °C
    2. 500 °C
    3. 600 °C
    4. 700 °C
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